proto becomes bxcore, the one shared crate (M5b task 00)

Done the way the owner asked and the spike mapped: the crate and the
manifests renamed, then what the build reported fixed. Layers: 138
"proto unresolved" errors across 169 files; cargo fmt reordering
imports; six fixture paths built as strings in brokerd's and bxctl's
tests, which the compiler cannot see, and comments naming
crates/proto/; the crate-dependency check and its self-test. One more
the spike did not reach: a `\nproto =` key inside a printf format in
the self-test, which a word-boundary replacement skips because `n` and
`p` are both word characters.

make gate: gate: ok, 944 tests; no new entry in /tmp.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

crates/gatewayd/src/approvals/mod.rs

@@ -7,7 +7,7 @@ use std::collections::{HashMap, HashSet};
 use std::sync::mpsc::Sender;
 use std::sync::{Mutex, MutexGuard};
 
-use proto::ApprovalReply;
+use bxcore::ApprovalReply;
 
 use crate::sessions::ApprovalCommand::{self, Approve, Deny, Malformed};
 

crates/gatewayd/src/approvals/text.rs

@@ -1,8 +1,8 @@
 //! The text of an approval's posts, and of the line added when it ends (M4b spec, section 6).
 //! Nothing here is shortened: arguments too long to show whole are not shown at all.
 
-use proto::escape::escape_json_text;
-use proto::{DenyReason, PendingApproval, Timestamp, sha256};
+use bxcore::escape::escape_json_text;
+use bxcore::{DenyReason, PendingApproval, Timestamp, sha256};
 
 /// Arguments are split into parts of at most this many characters.
 pub const PART_CHARS: usize = 15_000;
@@ -196,7 +196,7 @@ pub fn asked_post(id: u64, asked: &Asked) -> String {
     } else {
         "a direct message"
     };
-    let escaped = proto::escape::escape_model_text(&asked.prompt);
+    let escaped = bxcore::escape::escape_model_text(&asked.prompt);
     let total = escaped.chars().count();
     let shown: String = escaped.chars().take(PROMPT_SHOWN).collect();
     let mut post = format!(

crates/gatewayd/src/deliver.rs

@@ -5,7 +5,7 @@ use std::os::unix::net::UnixStream;
 use std::path::Path;
 use std::time::{Duration, Instant};
 
-use proto::{
+use bxcore::{
     Envelope, ErrorCode, Message, PROTOCOL_VERSION, Turn, TurnEvent, WireError, read_frame,
     write_frame,
 };

crates/gatewayd/src/gateway.rs

@@ -9,7 +9,7 @@ use std::sync::Arc;
 use std::sync::mpsc::{self, Receiver, RecvTimeoutError, Sender, TryRecvError};
 use std::time::Duration;
 
-use proto::{
+use bxcore::{
     ApprovalPosted, ApprovalReply, Envelope, ErrorCode, FrameError, GatewayOutcome, Message,
     PROTOCOL_VERSION, PendingApproval, WireError, read_frame, write_frame,
 };

crates/gatewayd/src/serve/approvals.rs

@@ -4,7 +4,7 @@
 
 use std::sync::mpsc::Sender;
 
-use proto::{ApprovalReply, GatewayOutcome, PendingApproval};
+use bxcore::{ApprovalReply, GatewayOutcome, PendingApproval};
 
 use crate::approvals::Posted;
 use crate::approvals::text::{self, Asked, Ended};

crates/gatewayd/src/serve/mod.rs

@@ -12,7 +12,7 @@ use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::mpsc::{self, Receiver, Sender};
 use std::time::{Duration, Instant};
 
-use proto::SessionId;
+use bxcore::SessionId;
 
 use crate::approvals::Registry;
 use crate::config::Config;

crates/gatewayd/src/sessions.rs

@@ -3,7 +3,7 @@
 
 use std::collections::{BTreeSet, HashMap};
 
-use proto::SessionId;
+use bxcore::SessionId;
 
 use crate::mm::Post;
 
@@ -71,7 +71,7 @@ pub enum ApprovalCommand {
 }
 
 /// The longest reason a `!deny` may give, in characters.
-pub const MAX_REASON: usize = proto::MAX_REASON;
+pub const MAX_REASON: usize = bxcore::MAX_REASON;
 
 /// `!approve …` or `!deny …` as an approval command; `None` for any other text.
 pub fn approval_command(text: &str) -> Option<ApprovalCommand> {

crates/gatewayd/src/ws/handshake.rs

@@ -34,11 +34,11 @@ pub fn base64(bytes: &[u8]) -> String {
 
 /// The `Sec-WebSocket-Accept` a server must send for `key`.
 pub fn accept_for(key: &str) -> String {
-    // base64(sha1(key + GUID)), with `proto::sha1::sha1`.
+    // base64(sha1(key + GUID)), with `bxcore::sha1::sha1`.
     let mut data = Vec::with_capacity(key.len() + GUID.len());
     data.extend_from_slice(key.as_bytes());
     data.extend_from_slice(GUID.as_bytes());
-    base64(&proto::sha1::sha1(&data))
+    base64(&bxcore::sha1::sha1(&data))
 }
 
 /// A fresh key: 16 bytes from `random` (in `gatewayd`, `/dev/urandom`), in base64.