# M5a task 04: entries and the check

**Branch:** `m5a` (run `git switch m5a`; `git status --short` must be empty, otherwise stop)
**Commit subject:** `memoryd: entries, and the check on every memory write`

## Goal

Two small modules (M5a spec, section 3 and section 5, "The check"):

- `entries`: `memory.md` and `user.md` are entries separated by a line holding only `§`. Parse,
  render, and measure a file in characters.
- `check`: every entry the agent writes, and every identity entry going into the prompt, is
  refused if it holds a control character (other than newline and tab), an invisible or
  direction-changing character, chat-template markup, or one of six instruction phrases. The
  table of invisible characters is written in the skeleton, from Unicode 16's
  `Default_Ignorable_Code_Point` property, plus six more.

## Files

- Copy (skeletons): `crates/memoryd/src/entries.rs`, `crates/memoryd/src/check.rs`
- Copy (tests): `crates/memoryd/tests/entries.rs`, `crates/memoryd/tests/check.rs`
- Modify: `crates/memoryd/src/lib.rs`, `docs/implementer-log.md`

## The edits, exactly

**`crates/memoryd/src/lib.rs`:** add `pub mod check;` before `pub mod config;`, and
`pub mod entries;` after it. The file then lists `check`, `config`, `entries`, `socket`.

## The skeletons

`entries.rs`: fill `parse`, `push`, `render`, `size`. `check.rs`: `Refused` and its sentences,
`DEFAULT_IGNORABLE`, `ALSO_INVISIBLE`, `MARKUP` and `PHRASES` are written; fill `invisible` and
`check`. Do not change the tables.

## Steps

- [ ] **1. Copy** the four files; edit `lib.rs`.
- [ ] **2. See it fail.** `cargo test -p memoryd --test entries --test check`: `entries` 3 failed,
  `check` 6 failed.
- [ ] **3. Fill** the six functions. `cargo fmt --all`.
- [ ] **4. See it pass.** The same command: 3 and 6 passed.
- [ ] **5. Run the gate.** `make gate`: `gate: ok`, 9 more tests than before (about 877).
- [ ] **6. Log and commit.** `git add -A crates/memoryd docs/implementer-log.md Cargo.lock && git commit`

## Done when

- `make gate` prints `gate: ok`.

## Stop and report if

- A test fails after the functions follow their comments exactly.