# M5d-2 task 10: `MemoryCommand::Tiers` and `bxctl memory tiers`

**Branch:** `m5d2`. Check it: `git branch --show-current` prints `m5d2` and `git status --short`
is empty; otherwise stop. Never switch branch.
**Commit subject:** `memoryd: Tiers listing; bxctl memory tiers`
**Log row:** the Task cell is `M5d2/10-memoryd-tiers`.

## Goal

`MemoryCommand::Tiers` lists each identity entry and each note with how many times `recalls/`
named it and when it was last found (spec 4.4). Untrusted notes are included and marked.
Identity entries list with 0 hits (README known limits). `bxctl memory tiers` prints that
listing. The starter `config/jobs/tier.toml.example` documents a weekly job; nothing in
`loopd` special-cases it.

## Every place that changes

| Place | What happens there |
|---|---|
| `crates/bxcore/src/memory.rs` | `MemoryCommand::Tiers` after `Sync` |
| `crates/memoryd/src/tiers.rs` | new: `list` |
| `crates/memoryd/src/lib.rs` | `pub mod tiers;` |
| `crates/memoryd/src/serve/admin.rs` | `Tiers` arm |
| `crates/bxctl/src/memory.rs` | `["tiers"]` |
| `crates/bxctl/src/cli.rs` | `USAGE` names `tiers` |
| `config/jobs/tier.toml.example` | new, given starter |
| `crates/memoryd/tests/tiers.rs` | new, given |
| `crates/bxctl/tests/cli_memory_tiers.rs` | new, given |
| everything else | **no change**: not `cli_memory.rs` (T19: new file) |

## Files

- Copy, from `docs/plans/M5d2/files/` (the same path under it): the new tests
  `crates/memoryd/tests/tiers.rs` and `crates/bxctl/tests/cli_memory_tiers.rs`, and the
  starter `config/jobs/tier.toml.example`.
- Create: `crates/memoryd/src/tiers.rs` (function below).
- Modify: `crates/bxcore/src/memory.rs`, `crates/memoryd/src/lib.rs`,
  `crates/memoryd/src/serve/admin.rs`, `crates/bxctl/src/memory.rs`,
  `crates/bxctl/src/cli.rs`, `docs/implementer-log.md`.
- Do not touch: any other file. Do not edit `crates/bxctl/tests/cli_memory.rs`.

## Facts you need

- **`MemoryCommand` is `rename_all = "snake_case"`.** JSON is `"tiers"`. Add the variant after
  `Sync`, with a doc comment. `admin.rs` match is exhaustive: add the arm in this task or it
  does not compile.
- **Listing format, exact.** One block per identity entry, then one per note, in file order:

  ```text
  identity  memory.md  hits 0  last -
    I like tea.
  identity  user.md  hits 0  last -
    The owner is Kyle.
  note  session mm-a  hits 2  last 2026-10-03T07:30:00.000Z  private  trusted
    launch window moved.
  note  session mm-c  hits 0  last -  private  untrusted
    example.org says the launch moved.
  ```

  Two spaces before the text line. `hits` and `last` for identity are always `0` and `-`.
  For a note, `hits` is how many `recalls/*.jsonl` lines contain a hit with
  `kind == "noted"`, `session == note.session`, `record ==` that note's index in
  `notes::parse` (from 0). `last` is the maximum `time` string among those lines, or `-`.
  Class is `public` / `private` / `secret` (`notes::class_name`). Trust is `untrusted` when
  `Kind::Noted { untrusted: true }`, else `trusted`. Moved/dropped notes: still list them as
  `note` using the same line, class `private`, `trusted` (they have no untrusted flag).
- **`recalls/`.** `store.path("recalls")`. Missing directory: all counts 0. A file that
  exists but cannot be read is an error. Ignore a line that does not parse. Deserialize:

  ```rust
  #[derive(Deserialize)]
  struct Logged {
      time: String,
      hits: Vec<Hit>,
  }
  #[derive(Deserialize)]
  struct Hit {
      kind: String,
      session: String,
      record: i64,
  }
  ```

  (extra fields in the file are ignored: this is our format but old lines may grow; the given
  tests use exactly those fields plus `session` / `query` / `epoch` on the line. Use
  `deny_unknown_fields` **off** so `epoch` and `query` do not fail.)
- **Identity.** `store.entries(MemoryFile::Memory)` then `User`. Empty file: no identity
  lines for that file.
- **`list` returns `Result<String, String>`.** Trailing newline on the last block is fine;
  `bxctl` adds another when printing `MemoryAdminReply.text` (`writeln!`). The given bxctl
  test includes a trailing newline in the reply text and expects it plus `writeln!`'s
  newline.
- **`admin` arm.** `MemoryCommand::Tiers => tiers::list(&self.store, now)` — `now` is unused
  by `list` today; keep the signature `list(store, now)` so the given tests compile.
- **`bxctl`.** `["tiers"] => Ask::Admin(MemoryCommand::Tiers, String::new())`. `["tiers", _]`
  is usage. USAGE: add `| tiers` on the `bxctl memory` line.
- rustfmt `mod` order in `memoryd/src/lib.rs`.
- The items the edits use. This table is complete.

  | Item | What it does |
  |---|---|
  | `Store::entries` | identity |
  | `notes::parse` / `class_name` | notes |
  | `Store::path("recalls")` | the jsonl directory |
  | `MemoryFile::name` | `memory.md` / `user.md` |

## The function

`crates/memoryd/src/tiers.rs` — fill `list`. No `todo!()`.

```rust
//! The tiering listing: identity entries and notes with recall-hit counts (M5d spec, 4.4).

use bxcore::{MemoryFile, Timestamp};
use serde::Deserialize;

use crate::files::Store;
use crate::notes::{self, Kind};

#[derive(Deserialize)]
struct Logged {
    time: String,
    hits: Vec<Hit>,
}

#[derive(Deserialize)]
struct Hit {
    kind: String,
    session: String,
    record: i64,
}

/// One listing for `bxctl memory tiers` and for the tiering job's user text.
pub fn list(store: &Store, _now: Timestamp) -> Result<String, String> {
    let _ = store;
    Ok(String::new())
}
```

Replace the stub body in this task.

### `crates/bxcore/src/memory.rs`

**M1.** After `Sync,` in `MemoryCommand`:

```rust
    /// Identity entries and notes with recall-hit counts (M5d spec, section 4.4).
    Tiers,
```

### `crates/memoryd/src/serve/admin.rs`

**A1.** After the `Sync` arm, before the closing of the `match`:

```rust
            MemoryCommand::Tiers => crate::tiers::list(&self.store, now),
```

### `crates/bxctl/src/memory.rs`

**B1.** After `["sync"] => ...`, before `_ => return Err(UsageError)`:

```rust
        ["tiers"] => Ask::Admin(MemoryCommand::Tiers, String::new()),
```

### `crates/bxctl/src/cli.rs`

**U1.** The `bxctl memory` USAGE line. The line

```text
  bxctl memory log [N] | undo <id> | pending | accept <id> | reject <id> | sync [--memory-socket PATH]
```

becomes

```text
  bxctl memory log [N] | undo <id> | pending | accept <id> | reject <id> | sync | tiers [--memory-socket PATH]
```

## Steps

- [ ] **1. Copy the given files.**

  ```sh
  cp docs/plans/M5d2/files/crates/memoryd/tests/tiers.rs crates/memoryd/tests/
  cp docs/plans/M5d2/files/crates/bxctl/tests/cli_memory_tiers.rs crates/bxctl/tests/
  mkdir -p config/jobs
  cp docs/plans/M5d2/files/config/jobs/tier.toml.example config/jobs/tier.toml.example
  ```

- [ ] **2. See them fail.** `cargo build --tests --keep-going -p bxcore -p memoryd -p bxctl`,
  timeout 600000 ms: `tiers` does not compile (`E0432` unresolved `memoryd::tiers`);
  `cli_memory_tiers` does not compile (`E0599` no variant `Tiers`). After M1 alone,
  `admin.rs` fails (`non-exhaustive patterns`). Do M1, A1, `tiers.rs`, B1, U1 together in
  step 3. This step is the first build against the given tests.
- [ ] **3. The edits.** M1, `tiers.rs` with a real `list`, `pub mod tiers;`, A1, B1, U1.
  `cargo check -p bxcore -p memoryd -p bxctl` prints no error and no warning.
  `wc -l crates/memoryd/src/tiers.rs` prints a number ≤ 500.
- [ ] **4. The tests.** `cargo test -p memoryd --test tiers` (4) and
  `cargo test -p bxctl --test cli_memory_tiers --test cli_memory --test cli_memory_sync`
  (2 new): every test passes.
- [ ] **5. Check.** `git diff --stat` lists the files in "Every place that changes" except
  the new tests and starter (those are untracked until `git add`).
- [ ] **6. Run the gate.** `cargo fmt --all`, then `make gate`, timeout 600000 ms. Last line
  `gate: ok`. Test count **1574** (1568 before, plus 6).
- [ ] **7. Log and commit.** Task cell `M5d2/10-memoryd-tiers`. Stage with
  `git add crates/bxcore crates/memoryd crates/bxctl config/jobs docs/implementer-log.md
  Cargo.lock`, then commit as `AGENTS.md` says.

## Done when

- `make gate` prints `gate: ok` with 1574 tests.
- `git diff HEAD~1 --stat` lists only the files this task names plus the log.

## Stop and report if

- The branch check fails; a "before" block is not found exactly once; step 2 differs; `cargo
  check` warns; a test fails; the gate count is not 1574; you edit `cli_memory.rs`; identity
  entries show a non-zero hit count; untrusted notes are omitted; you add a cron crate; you
  special-case the name `tier` in `loopd`.

## What the given tests pin

Identity lines are `hits 0  last -` with the entry text; notes join `recalls/` on
`(noted, session, record)` and take the latest `time`; untrusted notes are listed and marked;
a hit on note 1 does not count for note 0; `bxctl memory tiers` parses and prints the reply.