# Tasks: drive-mesh-protocol-v1

**Change ID**: drive-mesh-protocol-v1
**Capability**: `drive-mesh-protocol` (new)
**New package**: `@suaveplan/drive-mesh-protocol` (types + codecs + validators only; zero runtime side effects)
**Target path**: `packages/drive/drive-mesh-protocol/`
**Prerequisite packages on Verdaccio**: `@suaveplan/types`, `@suaveplan/error`, `@suaveplan/bitpacker`, `@suaveplan/bitpacker-compressed`, `@suaveplan/bitpacker-network`, `@suaveplan/bitpacker-schema`, `@suaveplan/crypto`

> Every checkbox MUST reflect work actually done in this change. Do not retroactively tick boxes for work that was already in main when this change opened. Do not tick a box for a test that doesn't exist or doesn't pin the requirement it claims to verify.

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## 1. Spec authoring

- [x] 1.1 Read `openspec/AGENTS.md` Sections 0, 11, 13, and 14
- [x] 1.2 Draft `proposal.md`
- [x] 1.3 Draft `specs/drive-mesh-protocol/spec.md` with 22 ADDED requirements
- [x] 1.4 Every requirement carries a `**Verified by:**` line
- [x] 1.5 Source mapping section completed (genesis-original; antecedents listed)
- [x] 1.6 Parity Checklist completed (genesis-original — no upstream)
- [x] 1.7 Impact section enumerates affected dependents

## 2. Implementation — `@suaveplan/drive-mesh-protocol` package

- [x] 2.1 Create package skeleton at `packages/drive/drive-mesh-protocol/`
- [x] 2.2 `package.json` — workspace, type:module, sideEffects:false, catalog deps
- [x] 2.3 `src/types/request.ts` — `ChunkRequest`, `ChunkRequestEnvelope`, `ChunkRequestPayload`
- [x] 2.4 `src/types/advertise.ts` — `ChunkAdvertiseEnvelope`, `ChunkAdvertisePayload`
- [x] 2.5 `src/types/response.ts` — `ChunkResponseEnvelope`, `ChunkResponsePayload`, `ChunkBytes`
- [x] 2.6 `src/types/error.ts` — `ChunkErrorEnvelope`, `ChunkErrorCode` enum
- [x] 2.7 `src/codec/request.ts` — encode/decode via `@suaveplan/bitpacker-network`
- [x] 2.8 `src/codec/advertise.ts` — bitset payload via `@suaveplan/bitpacker-compressed`
- [x] 2.9 `src/codec/response.ts` — multi-chunk payload + presence piggyback
- [x] 2.10 `src/codec/error.ts`
- [x] 2.11 `src/select/form.ts` — auto-selection logic (>64 chunks → bitset)
- [x] 2.12 `src/trust/score.ts` — per-(peerId, fileId) trust map
- [x] 2.13 `src/trust/decay.ts` — probabilistic skip logic
- [x] 2.14 `src/trust/sample.ts` — adaptive sample-verification rate
- [x] 2.15 `src/error-codes.ts` — `defineCodes("DMP", [...])` registry
- [x] 2.16 `src/index.ts` — barrel
- [x] 2.17 Subpath exports: `./types`, `./codec`, `./select`, `./trust`, `./errors`
- [x] 2.18 Sibling `.md` for every `.ts` (≥200 words, basic + advanced examples)
- [x] 2.19 Root `README.md` with Quick start + Modules

## 3. Tests (`tests/`)

- [x] 3.1 `three-form-roundtrip.test.ts` — every `ChunkRequest` form roundtrips
- [x] 3.2 `bitset-rle.test.ts` — fast-check property over random bit densities
- [x] 3.3 `generation-monotonic.test.ts` — out-of-order drop logic
- [x] 3.4 `piggyback-presence.test.ts` — `cd:response` updates peer-index
- [x] 3.5 `trust-decay.test.ts` — repeated lying demotes; bad sig terminates
- [x] 3.6 `cap-respected.test.ts` — `maxChunks` enforcement
- [x] 3.7 `empty-specific-rejected.test.ts` — `kind:'specific'` with `[]` rejected
- [x] 3.8 `bitset-length-invariant.test.ts` — `presence.length !== totalChunks` rejected
- [x] 3.9 `error-envelope-shape.test.ts` — every `ChunkErrorCode` round-trips
- [x] 3.10 `codec-mandate.test.ts` — non-bitpacker-encoded payloads rejected
- [x] 3.11 `spec-conformance.test.ts` — every `**Verified by:**` line resolves to a real test
- [x] 3.12 `error-codes.spec-conformance.test.ts` — registry frozen, codes namespaced

## 4. Documentation

- [x] 4.1 Sibling `.md` for every implementation `.ts` (excludes barrels, `.types.ts`, tests)
- [x] 4.2 Root `README.md` with package description, Modules section linking to each `.md`
- [x] 4.3 Update `docs/drive/mesh-protocol.md` to reference the new package's actual exports

## 5. Pre-archive verification (the 5-gate triple)

- [x] 5.1 `bun run check` — Biome 0 errors / 0 warnings / 0 info
- [x] 5.2 `bunx turbo lint typecheck test --filter=@suaveplan/drive-mesh-protocol` — green
- [x] 5.3 `bunx turbo test:coverage --filter=@suaveplan/drive-mesh-protocol` — 100/100/100/100
- [x] 5.4 `bun scripts/openspec-conformance.ts @suaveplan/drive-mesh-protocol` — exit 0
- [x] 5.5 `bunx turbo build --filter=@suaveplan/drive-mesh-protocol` — green

## 6. Pre-archive 7-row checklist (AGENTS.md §13)

- [x] 6.1 Generics threaded; `expectTypeOf` assertions on type-shape claims
- [x] 6.2 Zod schemas for every public type (sibling `*.schemas.ts` — but bitpacker-schema is the wire validator)
- [x] 6.3 Frozen `DMP_CODES` registry; every thrown error extends `SuaveplanError`
- [x] 6.4 Strict-mode behaviors tested (rejection paths each have an explicit test)
- [x] 6.5 OTel instruments: `dmp.envelope.encoded` (counter), `dmp.envelope.bytes` (histogram), `dmp.trust.score` (gauge)
- [x] 6.6 Lifecycle dedup: trust map respects (peerId, fileId) tuple; cleanup on peer disconnect
- [x] 6.7 No retroactive tick — every box reflects work done in this change

## 7. Dependents update

- [x] 7.1 `openspec/changes/drive-mesh-port/proposal.md` — `MESH-GOSSIP-01` references `DMP-08..09`; `cd:request` references `DMP-01..05`
- [x] 7.2 `openspec/changes/network-plugin-content-delivery/proposal.md` — references this protocol for forwarding semantics
- [x] 7.3 `openspec/changes/network-plugin-relay/proposal.md` — references the envelopes it carries cross-mesh

## 8. Behavior-change propagation (AGENTS §13a)

- [x] 8.1 Update `docs/drive/mesh-protocol.md` if any spec wording shifts during implementation
- [x] 8.2 Migration note in `proposal.md` already lists the search command for old `cd:request` references
- [x] 8.3 Run `grep -rln "cd:request\|cd:advertise\|cd:response" openspec/changes/ --include="*.md"` and update every hit (or document why not)

## 9. Archive

- [x] 9.1 Fold spec delta into `openspec/specs/drive-mesh-protocol/spec.md` (new top-level capability spec)
- [x] 9.2 Move `openspec/changes/drive-mesh-protocol-v1/` → `openspec/archive/<yyyy-mm-dd>-drive-mesh-protocol-v1/`
- [x] 9.3 Refresh `MANIFEST.md` (new package adds a row)
- [x] 9.4 Update `STATUS.md` migration note if the package displaces or duplicates anything in upstream