diff --git a/crates/gatewayd/src/lib.rs b/crates/gatewayd/src/lib.rs
index f74fc8a..3f502d6 100644
--- a/crates/gatewayd/src/lib.rs
+++ b/crates/gatewayd/src/lib.rs
@@ -6,4 +6,5 @@ pub mod http;
 pub mod mm;
 pub mod net;
 pub mod secrets;
+pub mod sessions;
 pub mod ws;
diff --git a/crates/gatewayd/src/sessions.rs b/crates/gatewayd/src/sessions.rs
new file mode 100644
index 0000000..d9b78c7
--- /dev/null
+++ b/crates/gatewayd/src/sessions.rs
@@ -0,0 +1,294 @@
+//! Which posts `gatewayd` acts on, which session each belongs to, commands, and the queue of
+//! messages per session (M4a spec, section 7). Pure: the state file and the network are elsewhere.
+
+use std::collections::{BTreeSet, HashMap};
+
+use proto::SessionId;
+
+use crate::mm::Post;
+
+pub const M4B_COMMAND: &str = "approvals over Mattermost arrive in M4b; use `bxctl approvals`";
+pub const UNKNOWN_COMMAND: &str = "unknown command; the commands are !approve and !deny";
+pub const BUSY: &str = "busy: too many messages are waiting in this conversation";
+
+/// Names that name nobody: every agent in the channel would answer them.
+const EVERYONE: [&str; 3] = ["channel", "here", "all"];
+
+/// Why a post was not acted on. Only `NotAllowed` is logged, by user id and post id.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Ignored {
+    Own,
+    System,
+    NotAllowed,
+    NotForUs,
+}
+
+/// Where an answer goes: a channel, and the root of the thread in it.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Thread {
+    pub channel: String,
+    pub root: String,
+}
+
+/// A message for a session.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Message {
+    pub session: SessionId,
+    pub thread: Thread,
+    /// A reply in a thread: the session should exist already.
+    pub resume: bool,
+    pub text: String,
+    /// A thread in a channel or group message that this Boxmaker now takes part in.
+    pub joins_thread: bool,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum Route {
+    Ignore(Ignored),
+    /// Answer in the thread without a turn (a command).
+    Reply {
+        thread: Thread,
+        text: String,
+    },
+    Queue(Message),
+}
+
+pub struct Router {
+    me_id: String,
+    me_name: String,
+    users: BTreeSet<String>,
+    channels: BTreeSet<String>,
+}
+
+/// Every `@name` in a message, lower-cased: `a-z`, `0-9`, `.`, `-` and `_` after an `@`, without
+/// trailing dots.
+pub fn named(message: &str) -> Vec<String> {
+    // Find each "@". The name after it is the longest run of ASCII letters, digits, ".", "-" and
+    // "_", with trailing "." removed and lower-cased. Skip empty names. Continue after the name.
+    let mut names = Vec::new();
+    let bytes = message.as_bytes();
+    let mut i = 0;
+    while i < bytes.len() {
+        if bytes[i] != b'@' {
+            i += 1;
+            continue;
+        }
+        let start = i + 1;
+        let mut j = start;
+        while j < bytes.len() {
+            let c = bytes[j];
+            if c.is_ascii_alphanumeric() || c == b'.' || c == b'-' || c == b'_' {
+                j += 1;
+            } else {
+                break;
+            }
+        }
+        if j > start {
+            let trimmed = message[start..j].trim_end_matches('.').to_lowercase();
+            if !trimmed.is_empty() {
+                names.push(trimmed);
+            }
+        }
+        i = j;
+    }
+    names
+}
+
+impl Router {
+    pub fn new(me_id: &str, me_name: &str, users: &[String], channels: &[String]) -> Router {
+        // Store the ids, the username lower-cased, and the two lists as sets.
+        Router {
+            me_id: me_id.to_string(),
+            me_name: me_name.to_lowercase(),
+            users: users.iter().cloned().collect(),
+            channels: channels.iter().cloned().collect(),
+        }
+    }
+
+    /// Is a post in a channel or group message for this Boxmaker? `known` says whether it has a
+    /// session for a thread root.
+    fn for_us(&self, post: &Post, known: &dyn Fn(&str) -> bool) -> bool {
+        // Named this bot -> true. Otherwise true only for a reply (root_id not empty) in a known
+        // thread (`known(root_id)`) that names nobody but channel, here or all.
+        let names = named(&post.message);
+        if names.iter().any(|n| n == &self.me_name) {
+            return true;
+        }
+        if post.root_id.is_empty() || !known(&post.root_id) {
+            return false;
+        }
+        names.iter().all(|n| EVERYONE.contains(&n.as_str()))
+    }
+
+    /// What to do with a new post (a post seen before is dropped by the caller first).
+    pub fn route(&self, post: &Post, channel_type: &str, known: &dyn Fn(&str) -> bool) -> Route {
+        // Section 7 of the spec, in this order: own post -> Ignore(Own); kind not empty ->
+        // Ignore(System); user not allowed -> Ignore(NotAllowed); then the channel: "D" is always
+        // ours; "O", "P" or "G" is ours when its id is allowed and `for_us`; anything else ->
+        // Ignore(NotForUs). The thread root is root_id, or the post id when root_id is empty. Then
+        // commands: "!!..." drops one "!" and goes on as a message; "!" then a first word approve
+        // or deny -> Reply M4B_COMMAND; any other "!" -> Reply UNKNOWN_COMMAND. Then Queue: session
+        // "mm-<root>" (if SessionId::new fails, Ignore(NotForUs)), resume = root_id not empty,
+        // joins_thread = not "D".
+        if post.user_id == self.me_id {
+            return Route::Ignore(Ignored::Own);
+        }
+        if !post.kind.is_empty() {
+            return Route::Ignore(Ignored::System);
+        }
+        if !self.users.contains(&post.user_id) {
+            return Route::Ignore(Ignored::NotAllowed);
+        }
+        let channel_ok = match channel_type {
+            "D" => true,
+            "O" | "P" | "G" => self.channels.contains(&post.channel_id) && self.for_us(post, known),
+            _ => false,
+        };
+        if !channel_ok {
+            return Route::Ignore(Ignored::NotForUs);
+        }
+
+        let root = if post.root_id.is_empty() {
+            post.id.clone()
+        } else {
+            post.root_id.clone()
+        };
+        let session = match SessionId::new(&format!("mm-{root}")) {
+            Ok(session) => session,
+            Err(_) => return Route::Ignore(Ignored::NotForUs),
+        };
+        let thread = Thread {
+            channel: post.channel_id.clone(),
+            root: root.clone(),
+        };
+
+        let message = &post.message;
+        if let Some(rest) = message.strip_prefix("!!") {
+            return Route::Queue(Message {
+                session,
+                thread,
+                resume: !post.root_id.is_empty(),
+                text: format!("!{rest}"),
+                joins_thread: channel_type != "D",
+            });
+        }
+        if let Some(after) = message.strip_prefix('!') {
+            let answer = match after.split_whitespace().next() {
+                Some("approve") | Some("deny") => M4B_COMMAND,
+                _ => UNKNOWN_COMMAND,
+            };
+            return Route::Reply {
+                thread,
+                text: answer.to_string(),
+            };
+        }
+
+        Route::Queue(Message {
+            session,
+            thread,
+            resume: !post.root_id.is_empty(),
+            text: message.clone(),
+            joins_thread: channel_type != "D",
+        })
+    }
+}
+
+/// A turn to send: every message that was waiting, joined with a blank line.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Batch {
+    pub session: SessionId,
+    pub thread: Thread,
+    pub resume: bool,
+    pub text: String,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum Pushed {
+    /// No turn was running: send this one now.
+    Start(Batch),
+    /// A turn is running; the message waits for the next.
+    Waiting,
+    /// Too many are waiting: the message is dropped, answer `BUSY`.
+    Full(Thread),
+}
+
+struct Pending {
+    thread: Thread,
+    waiting: Vec<String>,
+}
+
+/// The sessions with a turn running, and the messages waiting for each.
+pub struct Queues {
+    limit: usize,
+    running: HashMap<SessionId, Pending>,
+}
+
+impl Queues {
+    /// `limit` is the most messages that may wait per session.
+    pub fn new(limit: usize) -> Queues {
+        // An empty map.
+        Queues {
+            limit,
+            running: HashMap::new(),
+        }
+    }
+
+    pub fn push(&mut self, message: Message) -> Pushed {
+        // If the session is running: with `limit` messages already waiting -> Full(thread); else
+        // add the text to waiting -> Waiting. Otherwise insert it as running (its later batches
+        // resume: true) and return Start with this message alone.
+        let limit = self.limit;
+        if let Some(pending) = self.running.get_mut(&message.session) {
+            if pending.waiting.len() >= limit {
+                return Pushed::Full(pending.thread.clone());
+            }
+            pending.waiting.push(message.text.clone());
+            return Pushed::Waiting;
+        }
+        let batch = Batch {
+            session: message.session.clone(),
+            thread: message.thread.clone(),
+            resume: message.resume,
+            text: message.text.clone(),
+        };
+        self.running.insert(
+            message.session,
+            Pending {
+                thread: message.thread.clone(),
+                waiting: Vec::new(),
+            },
+        );
+        Pushed::Start(batch)
+    }
+
+    /// A session's turn ended: the next batch, or `None`, and the session is no longer running.
+    pub fn finish(&mut self, session: &SessionId) -> Option<Batch> {
+        // Not running -> None. Nothing waiting -> remove it, None. Otherwise take every waiting
+        // text, joined with "\n\n", as the next Batch (it stays running).
+        let mut pending = self.running.remove(session)?;
+        if pending.waiting.is_empty() {
+            return None;
+        }
+        let batch = Batch {
+            session: session.clone(),
+            thread: pending.thread.clone(),
+            resume: true,
+            text: pending.waiting.join("\n\n"),
+        };
+        pending.waiting.clear();
+        self.running.insert(session.clone(), pending);
+        Some(batch)
+    }
+
+    /// How many sessions have a turn running.
+    pub fn running(&self) -> usize {
+        // How many sessions are running.
+        self.running.len()
+    }
+
+    /// The threads with a turn running, for showing this bot as typing in them.
+    pub fn threads(&self) -> Vec<Thread> {
+        // The thread of every running session.
+        self.running.values().map(|p| p.thread.clone()).collect()
+    }
+}
diff --git a/crates/gatewayd/tests/sessions.rs b/crates/gatewayd/tests/sessions.rs
new file mode 100644
index 0000000..3c48d77
--- /dev/null
+++ b/crates/gatewayd/tests/sessions.rs
@@ -0,0 +1,298 @@
+//! Which posts become turns, in which session, and how messages wait for a running turn (M4a spec,
+//! section 7, including its table of examples). Do not edit.
+
+use gatewayd::mm::Post;
+use gatewayd::sessions::{
+    BUSY, Batch, Ignored, M4B_COMMAND, Message, Pushed, Queues, Route, Router, Thread,
+    UNKNOWN_COMMAND, named,
+};
+use proto::SessionId;
+
+const BOT: &str = "b0000000000000000000000000";
+const KYLE: &str = "k0000000000000000000000000";
+const EVE: &str = "e0000000000000000000000000";
+const DM: &str = "d0000000000000000000000000";
+const SHARED: &str = "c0000000000000000000000000";
+const OTHER: &str = "o0000000000000000000000000";
+const ROOT: &str = "r0000000000000000000000000";
+const POST: &str = "p0000000000000000000000000";
+
+fn router() -> Router {
+    Router::new(
+        BOT,
+        "boxmaker-straylight",
+        &[KYLE.to_string()],
+        &[SHARED.to_string()],
+    )
+}
+
+fn post(channel: &str, root: &str, message: &str) -> Post {
+    Post {
+        id: POST.to_string(),
+        user_id: KYLE.to_string(),
+        channel_id: channel.to_string(),
+        root_id: root.to_string(),
+        message: message.to_string(),
+        create_at: 5,
+        delete_at: 0,
+        kind: String::new(),
+    }
+}
+
+fn known(root: &str) -> bool {
+    root == ROOT
+}
+
+fn unknown(_: &str) -> bool {
+    false
+}
+
+fn queued(route: Route) -> Message {
+    match route {
+        Route::Queue(m) => m,
+        other => panic!("not queued: {other:?}"),
+    }
+}
+
+#[test]
+fn the_examples_in_the_spec() {
+    let r = router();
+    let cases = [
+        ("", "@boxmaker-straylight summarise the audit log", true),
+        (ROOT, "and the older files?", true),
+        (ROOT, "@hermes what do you think?", false),
+        ("", "@boxmaker-straylight @hermes compare notes", true),
+        ("", "@boxmaker-straylightx hello", false),
+        ("", "@channel standup in five", false),
+    ];
+    for (root, message, yes) in cases {
+        let got = r.route(&post(SHARED, root, message), "O", &known);
+        assert_eq!(matches!(got, Route::Queue(_)), yes, "{message}: {got:?}");
+        if !yes {
+            assert_eq!(got, Route::Ignore(Ignored::NotForUs), "{message}");
+        }
+    }
+}
+
+#[test]
+fn naming() {
+    assert_eq!(named("@Boxmaker-Straylight, look"), ["boxmaker-straylight"]);
+    assert_eq!(named("ask @boxmaker-straylight."), ["boxmaker-straylight"]);
+    assert_eq!(named("@a.b_c-d... and @e"), ["a.b_c-d", "e"]);
+    assert_eq!(named("@ alone, @@x, trailing @"), ["x"]);
+    assert_eq!(named("ünïcødé @ʙob @bob"), ["bob"]);
+    assert!(named("no names here").is_empty());
+    let r = router();
+    for message in [
+        "hi @BOXMAKER-STRAYLIGHT",
+        "@boxmaker-straylight.",
+        "(@boxmaker-straylight)",
+    ] {
+        assert!(
+            matches!(
+                r.route(&post(SHARED, "", message), "P", &unknown),
+                Route::Queue(_)
+            ),
+            "{message}"
+        );
+    }
+}
+
+#[test]
+fn replies_in_our_thread_that_name_everyone_are_still_ours() {
+    let r = router();
+    for message in ["@here any news?", "@all done", "thanks @channel"] {
+        assert!(
+            matches!(
+                r.route(&post(SHARED, ROOT, message), "O", &known),
+                Route::Queue(_)
+            ),
+            "{message}"
+        );
+    }
+    let got = r.route(
+        &post(
+            SHARED,
+            "q0000000000000000000000000",
+            "a reply in someone else's thread",
+        ),
+        "O",
+        &known,
+    );
+    assert_eq!(got, Route::Ignore(Ignored::NotForUs));
+}
+
+#[test]
+fn who_and_where() {
+    let r = router();
+    let mut own = post(DM, "", "hello");
+    own.user_id = BOT.to_string();
+    assert_eq!(r.route(&own, "D", &unknown), Route::Ignore(Ignored::Own));
+    let mut system = post(DM, "", "joined");
+    system.kind = "system_join_channel".to_string();
+    assert_eq!(
+        r.route(&system, "D", &unknown),
+        Route::Ignore(Ignored::System)
+    );
+    let mut stranger = post(DM, "", "@boxmaker-straylight hello");
+    stranger.user_id = EVE.to_string();
+    assert_eq!(
+        r.route(&stranger, "D", &unknown),
+        Route::Ignore(Ignored::NotAllowed)
+    );
+    let mut stranger_cmd = post(DM, "", "!approve 1");
+    stranger_cmd.user_id = EVE.to_string();
+    assert_eq!(
+        r.route(&stranger_cmd, "D", &unknown),
+        Route::Ignore(Ignored::NotAllowed)
+    );
+    let naming = "@boxmaker-straylight hello";
+    assert_eq!(
+        r.route(&post(OTHER, "", naming), "O", &unknown),
+        Route::Ignore(Ignored::NotForUs)
+    );
+    assert_eq!(
+        r.route(&post(SHARED, "", naming), "X", &unknown),
+        Route::Ignore(Ignored::NotForUs)
+    );
+    assert!(matches!(
+        r.route(&post(SHARED, "", naming), "G", &unknown),
+        Route::Queue(_)
+    ));
+    assert!(matches!(
+        r.route(&post(DM, "", "no name needed"), "D", &unknown),
+        Route::Queue(_)
+    ));
+}
+
+#[test]
+fn sessions_and_threads() {
+    let r = router();
+    let top = queued(r.route(&post(DM, "", "hello"), "D", &unknown));
+    assert_eq!(top.session.as_str(), format!("mm-{POST}"));
+    assert_eq!(
+        top.thread,
+        Thread {
+            channel: DM.to_string(),
+            root: POST.to_string()
+        }
+    );
+    assert!(!top.resume && !top.joins_thread);
+    assert_eq!(top.text, "hello");
+    let reply = queued(r.route(&post(DM, ROOT, "more"), "D", &unknown));
+    assert_eq!(reply.session.as_str(), format!("mm-{ROOT}"));
+    assert_eq!(reply.thread.root, ROOT);
+    assert!(reply.resume);
+    let channel = queued(r.route(&post(SHARED, "", "@boxmaker-straylight hi"), "O", &unknown));
+    assert!(channel.joins_thread && !channel.resume);
+    assert_eq!(channel.text, "@boxmaker-straylight hi");
+}
+
+#[test]
+fn commands() {
+    let r = router();
+    let thread = Thread {
+        channel: DM.to_string(),
+        root: ROOT.to_string(),
+    };
+    let reply = |text: &str| Route::Reply {
+        thread: thread.clone(),
+        text: text.to_string(),
+    };
+    for (message, answer) in [
+        ("!approve 42", M4B_COMMAND),
+        ("!deny 42 not now", M4B_COMMAND),
+        ("!deny", M4B_COMMAND),
+        ("!approved", UNKNOWN_COMMAND),
+        ("!help", UNKNOWN_COMMAND),
+        ("!", UNKNOWN_COMMAND),
+    ] {
+        assert_eq!(
+            r.route(&post(DM, ROOT, message), "D", &unknown),
+            reply(answer),
+            "{message}"
+        );
+    }
+    assert_eq!(
+        queued(r.route(&post(DM, ROOT, "!!approve is a word"), "D", &unknown)).text,
+        "!approve is a word"
+    );
+    assert_eq!(
+        queued(r.route(&post(DM, ROOT, "!!"), "D", &unknown)).text,
+        "!"
+    );
+    assert_eq!(
+        queued(r.route(&post(DM, ROOT, " !help"), "D", &unknown)).text,
+        " !help"
+    );
+}
+
+fn message(root: &str, resume: bool, text: &str) -> Message {
+    Message {
+        session: SessionId::new(&format!("mm-{root}")).unwrap(),
+        thread: Thread {
+            channel: DM.to_string(),
+            root: root.to_string(),
+        },
+        resume,
+        text: text.to_string(),
+        joins_thread: false,
+    }
+}
+
+#[test]
+fn messages_wait_for_the_running_turn_and_go_together() {
+    let mut q = Queues::new(3);
+    let first = message(ROOT, false, "one");
+    let Pushed::Start(batch) = q.push(first.clone()) else {
+        panic!("not started")
+    };
+    assert_eq!(
+        batch,
+        Batch {
+            session: first.session.clone(),
+            thread: first.thread.clone(),
+            resume: false,
+            text: "one".to_string()
+        }
+    );
+    assert_eq!(q.push(message(ROOT, true, "two")), Pushed::Waiting);
+    assert_eq!(q.push(message(ROOT, true, "three\nlines")), Pushed::Waiting);
+    let other = message(POST, false, "elsewhere");
+    assert!(
+        matches!(q.push(other.clone()), Pushed::Start(_)),
+        "another session starts at once"
+    );
+    assert_eq!(q.running(), 2);
+    let mut roots: Vec<String> = q.threads().into_iter().map(|t| t.root).collect();
+    roots.sort();
+    assert_eq!(roots, [POST, ROOT]);
+    let next = q.finish(&first.session).unwrap();
+    assert_eq!(
+        (next.text.as_str(), next.resume),
+        ("two\n\nthree\nlines", true)
+    );
+    assert_eq!(q.finish(&first.session), None);
+    assert_eq!(q.finish(&other.session), None);
+    assert_eq!(q.running(), 0);
+    assert!(
+        matches!(q.push(message(ROOT, true, "later")), Pushed::Start(_)),
+        "idle again"
+    );
+}
+
+#[test]
+fn a_full_queue_drops_the_message() {
+    let mut q = Queues::new(2);
+    let m = message(ROOT, false, "run");
+    assert!(matches!(q.push(m.clone()), Pushed::Start(_)));
+    assert_eq!(q.push(message(ROOT, true, "a")), Pushed::Waiting);
+    assert_eq!(q.push(message(ROOT, true, "b")), Pushed::Waiting);
+    assert_eq!(
+        q.push(message(ROOT, true, "c")),
+        Pushed::Full(m.thread.clone())
+    );
+    assert_eq!(q.finish(&m.session).unwrap().text, "a\n\nb");
+    assert!(!BUSY.is_empty());
+    assert_eq!(q.finish(&SessionId::new("mm-never").unwrap()), None);
+}
diff --git a/docs/implementer-log.md b/docs/implementer-log.md
index d792ac2..858a4bd 100644
--- a/docs/implementer-log.md
+++ b/docs/implementer-log.md
@@ -6,6 +6,7 @@ reviewer adds findings under "Reviews" once per milestone.
 
 | Task | Date | Status | Gate runs | First gate | Deviations | Notes | Model |
 |---|---|---|---|---|---|---|---|
+| M4a/11-gatewayd-sessions | 2026-09-23 | done | 2 | fail | Removed the `resume` field from the copied `Pending` struct (written by the skeleton but never read) | Filled `named` (byte scan for `@`, the longest run of ASCII alnum/`.` `-` `_` after it, trailing `.` trimmed, lower-cased, empty runs skipped, then continue past the name) and the `Router` (`route` is a straight line of early returns in spec order: own -> Ignore(Own); kind not empty -> System; user not in allow.users -> NotAllowed; then the channel where "D" is always ours and "O"/"P"/"G" needs an allowed channel id plus `for_us`; the thread root is `root_id` or the post id; `!!...` keeps one `!` and queues, a lone `!` or `!approve`/`!deny` is a command where approve/deny answers M4B_COMMAND and anything else UNKNOWN_COMMAND, a command never reaches loopd; then Queue with session `mm-<root>`, `resume = root_id not empty`, `joins_thread = channel_type != "D"`). `for_us` is true when it names this bot (case-insensitive), otherwise a reply in a known thread that names only channel/here/all. `Queues`: `push` starts a turn when idle (Start with that message alone), waits while running and returns Full(thread) at the limit; `finish` joins the waiting texts with "\n\n" as a resume:true Batch, clears the queue and stays running, removing the session when nothing waits. `Pending.resume` was dead code (the next turn is always a continuation so `finish` hardcodes resume:true) so I removed it rather than allow a lint. First gate failed on clippy `manual_strip`; switched `starts_with("!!")`/`starts_with('!')` plus `&message[2..]`/`&message[1..]` slicing to `strip_prefix`. All 8 sessions tests pass; `make gate` prints `gate: ok` on the second run. | ? |
 | M4a/10-gatewayd-mm | 2026-09-23 | done | 1 | pass | none | Copied `tests/mm_json.rs`, `tests/mm_rest.rs` and `tests/support/http_server.rs`, added the `src/mm/mod.rs` and `src/mm/rest.rs` skeletons to `crates/gatewayd/src/mm/` and `pub mod mm;` to `lib.rs` (before `secrets`, alphabetical). Filled `mod.rs`: `Post::check` requires `id`/`user_id`/`channel_id` `valid_id` and `root_id` empty-or-`valid_id`, else `Json` quoting the offending id with `{:?}`; `json` is `serde_json::from_slice` mapped to `Json(e.to_string())`; `parse_event` matches `hello`/`posted`/other — `posted` takes `data.post` as a JSON *string* (an object or missing is `Json`), parses it, `check`s it, and reads `data.channel_type` (else ""), any other name (or an empty-name reply) is `Other(name)`; `typing` is `serde_json::json!` compacted; `since_list` walks `order` only (skipping ids not in `posts`, keeping `create_at > since && delete_at == 0` after `check`, deduping, then sorting by `(create_at, id)`), `full` when `order.len() >= SINCE_LIMIT`. Filled `rest.rs`: `Client::new` stores the three fields; `once` connects within `timeout`, sets the read timeout, sends `Authorization: Bearer <token>` (the only `expose`), `Accept`/`Content-Type` headers and `host_header`, mapping every error to `Net("<method> <path>: <e>")`; `call` loops `once` — 2xx returns the body, 401/403 `Auth`, 429 waits `rate_limit_wait` up to `RETRIES` then `RateLimited`, 5xx retried up to `RETRIES` times sleeping `RETRY_5XX`, else `Status` with the first `BODY_KEPT` lossy-UTF-8 chars via a `status_error` helper; `me`/`create_post`/`posts_since`/`direct_channel` build the four calls, `posts_since` and `me`/`direct_channel` reject non-`valid_id` ids as `Json` before sending. All 7 `mm_json` and 10 `mm_rest` tests pass (the latter ~3 s on two deliberate rate-limit waits); `make gate` prints `gate: ok` first run. | ? |
 | M4a/09-gatewayd-ws-conn | 2026-09-23 | done | 1 | pass | none | Filled the eight functions in the copied `crates/gatewayd/src/ws/conn.rs` skeleton (the written `poll` was the glue). `open`: `connector.connect(dead_after)` mapped to `Handshake(e.to_string())`, then `handshake` with `host_header(connector.server())`, a Ws with a new `Decoder` and `last_heard`/`last_ping` both `now`. `send`: `read_exact` 4 mask bytes from `random`, then `encode(opcode, payload, mask)` written and flushed. `send_text`: `send(TEXT, text.as_bytes())`. `take_messages`: loop `next_message`, `Text` returns, `Ping` answered with `send(PONG, &payload)`, `Pong` ignored, `Close` replies the code as 2 big-endian bytes (empty when none) via a best-effort `send(CLOSE, ...)` (the peer may be gone) and returns `Closed`. `keep_alive`: `now.duration_since(last_heard) >= dead_after` is `Dead`, else `now.duration_since(last_ping) >= ping_every` pings and stamps `last_ping`. `read_timeout`: the least of next-ping, next-dead and until-left (each `saturating_duration_since`), then `.max(1ms)`. `read_some`: `set_read_timeout`, a 16 KiB buffer, `Ok(0)` -> `Closed`, `Ok(n)` feeds `buf.get(..n).unwrap_or_default()` and stamps `last_heard`, `WouldBlock`/`TimedOut`/`Interrupted` -> `Ok(())`, any other `Err` -> `Io`. `close`: best-effort `send(CLOSE, &1000u16.to_be_bytes())`. `host_header`: host alone when the port is the scheme default (443 for tls, 80 otherwise) else `host:port`. All 10 tests in `tests/ws_conn.rs` pass five runs under a second; `make gate` prints `gate: ok` first run. | ? |
 | M4a/08-gatewayd-ws-frames | 2026-09-23 | done | 1 | pass | none | Copied `tests/ws_frame.rs` and the `src/ws/frame.rs` skeleton, added `pub mod frame;` (before `handshake`, alphabetical). Filled the seven functions the comments specified verbatim: `check_first_bytes` (reserved bits `b0 & 0x70`, mask `b1 & 0x80`, opcode `matches!(b0 & 0x0F, CONTINUATION | TEXT | CLOSE | PING | PONG)`); `check_control` (not fin, then >125); `length` (match on `short`: 0..=125, 126 reading `buf.get(2..4)` into `u16::from_be_bytes` with `len < 126` refused, 127 reading `buf.get(2..10)` into `u64::from_be_bytes` with top-bit and `<= 0xFFFF` refused, `usize::try_from(len).unwrap_or(usize::MAX)`); `check_data` (TEXT while partial, CONTINUATION while none, `payload_len > MAX_MESSAGE.saturating_sub(so_far)`); `data_frame` (empty Vec for TEXT else `partial.take().unwrap_or_default()`, append, defer when not fin, `String::from_utf8` at fin); `close` (slice-pattern match, `u16::from_be_bytes` code, UTF-8 reason); `encode` (FIN+opcode, three length branches with mask bit, XOR with `mask.iter().cycle()`). All string literals got `.to_string()` for the `Protocol(String)` variant, matching http.rs. `length`'s match needed a defensive `_` arm (`128..=u8::MAX` unreachable since `short = b1 & 0x7F`) so the codec stays exhaustive without a panic. All 7 tests in `tests/ws_frame.rs` pass including the 300-seed property test against the naive decoder; `make gate` prints `gate: ok` first run. | ? |