# Tasks — enterprise-midi

> Every checkbox MUST reflect work actually done in this change. Retroactive ticking is the failure mode this template guards against.

## 0. Pre-flight (non-negotiable)

- [ ] 0.1 Confirm clean working tree (`git status` reports nothing) and no in-flight worktrees with uncommitted work (`git worktree list` then `git status` in each)
- [ ] 0.2 Account for every `.claude/worktrees/*` entry: still-active agent, work-pending-merge, or stale-and-prune. Stale worktrees MUST be removed via `bun scripts/worktree-prune.ts --remove` before opening a new one.
- [ ] 0.3 Confirm the package set in `MANIFEST.md` matches `find packages -maxdepth 3 -name package.json | wc -l`. Drift here means a prior change archived without regenerating the manifest.

## 1. Spec authoring

- [ ] 1.1 Read `openspec/AGENTS.md` Sections 13 and 14
- [ ] 1.2 Draft `proposal.md` + `tasks.md`; this file
- [ ] 1.3 Draft `specs/midi/spec.md` with numbered Requirements + `**Verified by:**` lines

## 2. Implementation

- [ ] 2.1 `src/error-codes.ts` — `MIDI.{INVALID_MESSAGE, INVALID_SYSEX, BUFFER_UNDERRUN, UNSUPPORTED_UMP_VARIANT, NRPN_INCOMPLETE}` via `defineCodes` + `MidiError`
- [ ] 2.2 `src/message/message.types.ts` — discriminated `MidiMessage` union (18 variants)
- [ ] 2.3 `src/message/encode.ts` + `decode.ts` — round-trip via fast-check property tests
- [ ] 2.4 `src/dispatch/running-status.ts` — running-status decoder state machine
- [ ] 2.5 `src/dispatch/nrpn.ts` + `rpn.ts` + `cc14.ts` — high-resolution-controller reducers
- [ ] 2.6 `src/sysex/sysex.ts` — `parseSysEx`, `buildSysEx`, manufacturer-id registry
- [ ] 2.7 `src/port/port.types.ts` — `MidiPortLike` structural contract
- [ ] 2.8 `src/clock/clock.ts` — `clockToBpm`, `bpmToClock`, 24 PPQN converters
- [ ] 2.9 `src/gm/{level1, level2, gs, xg}.ts` — patch tables as `readonly Record<number, string>`
- [ ] 2.10 `src/ump/ump.ts` — UMP32/64/96/128 framing + MIDI1 ↔ UMP bridge
- [ ] 2.11 `src/telemetry/telemetry.ts` — counter `midi_messages_decoded_total`, histogram `midi_decode_duration_ns`

## 3. Tests

- [ ] 3.1 Per-feature `.test.ts` covering every scenario in `spec.md`
- [ ] 3.2 `tests/property.test.ts` — fast-check round-trip on every message variant
- [ ] 3.3 `tests/conformance.test.ts` — General MIDI patch table integrity, UMP framing invariants
- [ ] 3.4 Every `it(...)` carries `{ timeout: 5000 }` (or 30000 for genuinely async)

## 4. Documentation

- [ ] 4.1 Sibling `.md` for every implementation `.ts` (≥200 words, basic + advanced examples, full API reference)
- [ ] 4.2 README links every co-located `.md` under `## Modules`

## 5. Pre-archive verification

- [ ] 5.1 `bunx turbo lint typecheck test --filter=@suaveplan/midi` — green
- [ ] 5.2 `bunx turbo test:coverage --filter=@suaveplan/midi` — 100/100/100/100
- [ ] 5.3 `bunx turbo build --filter=@suaveplan/midi` — green
- [ ] 5.4 `bun scripts/openspec/check-preflight.ts` — passes (this folder gates the lint)

## 6. Archive

- [ ] 6.1 Fold spec delta into `openspec/specs/midi/spec.md`
- [ ] 6.2 Move `openspec/changes/enterprise-midi/` → `openspec/archive/<yyyy-mm-dd>-enterprise-midi/`
- [ ] 6.3 Refresh `MANIFEST.md`
- [ ] 6.4 Prune any worktree this change opened (`bun scripts/worktree-prune.ts --remove`)