Tasks — QR code batch generator

Every checkbox MUST reflect work actually done in this change. Do not retroactively tick boxes.

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 If any worktrees exist under .claude/worktrees/, account for each one: still-active agent, work-pending-merge, or stale-and-prune. Stale worktrees MUST be removed (git worktree remove) before opening a new one — code that has been lost twice on main is the failure mode this guards against.
0.3 Confirm the package set in MANIFEST.md matches find packages -maxdepth 3 -name package.json count. Drift here means a prior change archived without regenerating the manifest.

1. Spec authoring

1.1 Read ../suaveplan/packages/universal/qrcode/src/batch/batch-generator.ts end-to-end
1.2 Read openspec/specs/qrcode/spec.md (does not exist yet — capability spec authored fresh in this change)
1.3 Read openspec/AGENTS.md Sections 13, 13a, 14, 14a
1.4 Draft proposal.md from openspec/templates/proposal.md
1.5 Fill in ## Source mapping table — every requirement cites a line range OR appears in the "no source line" table with justification
1.6 Draft specs/qrcode/spec.md from openspec/templates/spec-delta.md
1.7 Every requirement in the spec delta carries a **Verified by:** line naming concrete it(...) titles

2. Implementation

2.1 Add src/core/batch/batch-generator.ts exporting BatchQrCodeRequest, BatchQrCodeResult, BatchQrCodeOptions, BatchQrCodeSummary, generateBatch, generateBatchAsync, BatchQrCodeGenerator
2.2 Add src/core/batch/batch-generator.types.ts with shared interface declarations and Zod schemas (BatchQrCodeRequestSchema, BatchQrCodeOptionsSchema)
2.3 Wire QRCODE.BATCH_ABORTED into src/errors/qrcode-error.ts::QRCODE_CODES; throw QRCodeError (never plain Error) from the abort path and from per-item failures
2.4 Concurrency limiter — clamp to [1, 64]; sequential default for generateBatch; generateBatchAsync honours concurrency strictly; both honour AbortSignal between items
2.5 OTel instrumentation: qrcode.batch.items_total (counter), qrcode.batch.items_failed (counter), qrcode.batch.duration_ms (histogram)
2.6 Inject Clock via constructor dependency on BatchQrCodeGenerator; free functions use the default real clock
2.7 Add ./batch subpath to package.json exports
2.8 Re-export new symbols from src/index.ts

3. Tests

3.1 src/core/batch/batch-generator.test.ts — all scenarios from spec delta (in-order results, completion-order async iterable, failure isolation, concurrency clamp, onItem, abort, version-1-through-10 coverage)
3.2 src/core/batch/batch-generator.spec-conformance.test.ts — injectable Clock, Zod BatchQrCodeRequest rejection with structured ZodError, QRCODE.BATCH_ABORTED code emission, OTel counters/histogram asserted via in-memory MeterProvider
3.3 Property test (fast-check): for any Array<{ value }> of length ≤ 50 where every value fits a valid encoding, generateBatch SHALL return succeeded === input.length and failed === 0
3.4 Every it(...) carries { timeout: 5000 } (or 30000 for genuinely async)

4. Documentation

4.1 src/core/batch/batch-generator.md — sibling doc, ≥200 words, basic + advanced examples (sequential, async iterable, concurrent, abort, custom clock), full API reference for every public export, implementation notes covering concurrency clamping and per-item isolation
4.2 README links the new co-located .md under ## Modules
4.3 Update CLAUDE.md qrcode listing to mention "batch generation with per-item failure isolation"

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

5.1 bun run check — Biome 0 errors / 0 warnings / 0 info
5.2 bunx turbo lint typecheck test --filter=@suaveplan/qrcode — green
5.3 bunx turbo test:coverage --filter=@suaveplan/qrcode — 100/100/100/100
5.4 bun scripts/openspec-conformance.ts @suaveplan/qrcode — exit 0, no error findings
5.5 bunx turbo build --filter=@suaveplan/qrcode — green

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

6.1 Generics threaded; expectTypeOf assertions on BatchQrCodeResult discriminated-union narrowing
6.2 Zod schemas wired at every public boundary (generateBatch, generateBatchAsync, BatchQrCodeGenerator.generate, .stream)
6.3 Every error code in error-codes.ts thrown by at least one production path (QRCODE.BATCH_ABORTED covered by abort scenario)
6.4 Strict-mode behaviors tested both on and off (concurrency 1 vs > 1; failure isolation always on)
6.5 OTel instruments emitted from production paths and asserted with a real in-memory MeterProvider
6.6 Lifecycle dedup tested where claimed (BatchQrCodeGenerator.generate and .stream are stateless across calls — verified by parallel-call test)
6.7 No retroactive tick — every box above reflects work done in this change

7. Archive

7.1 Fold spec delta into openspec/specs/qrcode/spec.md (creates the canonical capability spec from scratch since none exists)
7.2 Move openspec/changes/qrcode-batch-generator/ → openspec/archive/<yyyy-mm-dd>-qrcode-batch-generator/
7.3 Refresh MANIFEST.md if package set or deps changed (no change expected — purely additive feature)

Audit Note (2026-05-02)

Status: DEFERRED.

State at audit:

@suaveplan/qrcode package itself is shipped and green, but the batch-generator feature has not been authored. No src/core/batch/ directory exists. The current src/core/ only contains encoder/, mask/, matrix/, reed-solomon/, renderer/, tables/, plus the top-level qrcode.ts orchestrator.
Section 1 (spec authoring) is checked, so the proposal + spec delta exist; Sections 2–7 (implementation, tests, docs, verification, archive) are entirely unchecked.
QRCODE.BATCH_ABORTED is not yet wired into src/errors/qrcode-error.ts::QRCODE_CODES.

Resuming work: execute Sections 2–7 in order. Reference upstream ../suaveplan/packages/universal/qrcode/src/batch/batch-generator.ts (read in Section 1.1). Note this proposal additionally requires generateBatchAsync (completion-order async iterable) which the barcode equivalent does not.

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