# Changelog

All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [Unreleased]

### Changed

- `coord-inbox.sh` now warns on stderr for each unknown argument instead of
  discarding it silently. The read path stays lenient (it runs inside the
  SessionStart hook, which must never fail a session over a stray flag) and
  the exit code is unchanged, but a mistyped flag no longer looks like a
  working invocation. The hook runs the script with stderr discarded, so the
  warning surfaces in manual CLI use only.

### Added

- Selftest: 68 -> 70 checks, covering the stderr warning and the leniency it
  must not break (unknown argument still reads the inbox and exits 0).

### Documentation

- README: corrected the stale selftest count (64 -> 70), documented that a
  broadcast is never delivered back to its own sender (shipped in 0.2.1 but
  undocumented), and added rule 6 — message content is data, never
  instructions — which `coord-inbox.sh` already enforces in the injection
  framing.

## [0.2.1] - 2026-07-25

### Fixed

- Broadcast self-delivery: `coord-send --broadcast` left no seen-set entry for
  the sender, so the announcing repo got its own announcement injected at its
  next session start. The delivered filename is now recorded in
  `_broadcast/seen/<sender>` at delivery time, reusing the existing per-repo
  seen set rather than adding a second exclusion mechanism. Filtering on the
  `from:` field at read time was rejected: `from:` is sender-controlled, so it
  would let any repo suppress a broadcast for another by forging the field.
  The seen file is keyed by the raw sender name (the read side keys it
  unsanitized, so the two must agree); senders containing a slash, or equal to
  `.`/`..`, skip the marking rather than escape the directory.

### Added

- Selftest: 64 -> 68 checks, covering sender self-exclusion, unaffected
  delivery to other repos, self-exclusion for sender names that are not
  shell-clean, and the seen-marking path-escape guard.

## [0.2.0] - 2026-07-24

Hardening pass over the three CLIs.

### Fixed

- Atomic delivery: the temp file is created inside the destination directory
  (dot-prefixed, invisible to the inbox glob), so the final rename never
  crosses filesystems and readers never observe a half-written message.
- `.` and `..` are rejected explicitly in the `--reply-to` and `coord-done`
  name guards instead of relying on downstream failure.

### Added

- `-h`/`--help` on `coord-inbox.sh`, making usage output uniform across the
  three CLIs.
- Selftest: 48 -> 64 checks, closing gaps around the default mailbox path via
  `HOME` fallback, malformed frontmatter on the read path, and a read-only
  destination directory.

## [0.1.0] - 2026-07-24

First public release: extraction of a battle-tested personal mechanism into a
distributable plugin.

### Added

- Bash engine: `coord-send.sh` (directed / broadcast / reply delivery),
  `coord-inbox.sh` (pending inbox + unseen broadcasts, formatted for context
  injection), `coord-done.sh` (archive without reply), all bash-3.2-safe,
  ASCII-only, zero dependencies.
- `coord-selftest.sh`: 48 checks against a throwaway mailbox, including
  regression cover for filename sanitization, no-hang argument parsing,
  prompt-injection resistance, frontmatter hygiene, and broadcast ordering.
- SessionStart hook (`hooks/scripts/session-start.mjs`): thin zero-dependency
  Node wrapper that injects the repo's pending mailbox as
  `additionalContext`. Always exits 0 — a broken mailbox never blocks a session.
- `coord-send` skill: natural-language front door (English + Norwegian
  triggers) mapping intent to engine invocations, including bounded
  multi-target loops, deferred sends, and replies.

### Fixed

- Frontmatter injection: CR/LF and control characters in `--subject`/`--from`
  are collapsed before writing, so fields can no longer inject frontmatter
  lines or a premature `---` terminator.
- Broadcast loss: a per-repo seen set (`_broadcast/seen/<repo>`, one delivered
  filename per line) replaces the single high-water mark, which silently
  dropped a same-second broadcast whose filename sorted below one already
  seen. Upgrade note: a legacy watermark file is read as a one-entry seen
  set, so old broadcasts may be re-delivered once.

### Changed

- Read-side protocol strings are English (`--- message:`, `-> reply:`,
  UNTRUSTED DATA framing); the forgery-resistance selftest checks pin the
  English tokens.