refactor(hooks): move Hook V2 replay drain into tracedecay-hooks

[ScriptedAlchemy]

Child of #707 for #1073 (composition root).

Hook V2 spool drain moves from the root crate into tracedecay-hooks as drain_host_spool_once(spool, project_id, binding, now, admit). The daemon keeps only hook_v2_replay_consumer.rs, which admits a host spool, passes the project id, and maps typed admission outcomes. No TraceDecay port, no compatibility re-export; the root hook_v2_replay.rs is deleted.

Behavior preserved: Backpressured/Unavailable retain records; stale/conflict/expired tombstone. New: a foreign project id is binding_unavailable and retains records (tested).

Verification: 13 hook_v2_replay tests in tracedecay-hooks pass; clippy -D warnings on tracedecay-hooks and tracedecay; fmt; commitlint.

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Latest commit: c59ddfb

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-09T08:42:36.724562Z	c59ddfb	PR opened

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[github-actions]

Performance Comparison codex/tracedecay-total-redesign-plan-reopened → grok/w1-hook-replay

Total Elapsed Time: 3.87s → 3.86s (-0.3%)
CPU Baseline: 89.04µs → 83.43µs (-6.3%)
Benchmark ID: index-bench-timing

timing - Execution duration of functions.

+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| Function                                 | Calls                      | Avg                            | P95                            | Total                          | % Total                      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| tracedecay-index-bench                   | 1 → 1 (+0.0%)              | 3.87s → 3.86s (-0.3%)          | 3.88s → 3.87s (-0.3%)          | 3.87s → 3.86s (-0.3%)          | 100.00% → 100.00% (+0.0%)    |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| query.artifact.append_pages              | 13 → 13 (+0.0%)            | 118.77ms → 118.68ms (-0.1%)    | 163.58ms → 163.32ms (-0.2%)    | 1.54s → 1.54s (+0.0%)          | 39.85% → 39.93% (+0.2%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| code_index.workers.install               | 83 → 83 (+0.0%)            | 13.55ms → 13.35ms (-1.5%)      | 46.60ms → 46.89ms (+0.6%)      | 1.12s → 1.11s (-0.9%)          | 29.03% → 28.67% (-1.2%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| domain.canonical.sha256                  | 110414 → 110414 (+0.0%)    | 8.46µs → 8.52µs (+0.7%)        | 11.01µs → 11.10µs (+0.8%)      | 933.96ms → 940.64ms (+0.7%)    | 24.11% → 24.34% (+1.0%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| query.artifact.batch.sqlite              | 13 → 13 (+0.0%)            | 68.57ms → 68.69ms (+0.2%)      | 93.91ms → 91.42ms (-2.7%)      | 891.38ms → 893.02ms (+0.2%)    | 23.01% → 23.11% (+0.4%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| code_index.build.and_publish             | 2 → 2 (+0.0%)              | 440.65ms → 438.62ms (-0.5%)    | 514.59ms → 509.87ms (-0.9%)    | 881.30ms → 877.23ms (-0.5%)    | 22.75% → 22.70% (-0.2%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| query.artifact.batch.postings            | 13 → 13 (+0.0%)            | 60.07ms → 59.70ms (-0.6%)      | 83.62ms → 80.48ms (-3.8%)      | 780.90ms → 776.16ms (-0.6%)    | 20.16% → 20.09% (-0.3%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| query.artifact.finalization.advance_wake | 14 → 14 (+0.0%)            | 44.47ms → 44.35ms (-0.3%)      | 270.27ms → 267.65ms (-1.0%)    | 622.51ms → 620.86ms (-0.3%)    | 16.07% → 16.07% (+0.0%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| code_index.chunk.index_file              | 276 → 276 (+0.0%)          | 2.13ms → 2.08ms (-2.3%)        | 3.15ms → 3.05ms (-3.2%)        | 587.24ms → 575.34ms (-2.0%)    | 15.16% → 14.89% (-1.8%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| code_index.extract.parser_artifact       | 276 → 276 (+0.0%)          | 2.11ms → 2.07ms (-1.9%)        | 3.23ms → 3.14ms (-2.8%)        | 582.86ms → 571.83ms (-1.9%)    | 15.04% → 14.80% (-1.6%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| query.artifact.prepare_pages             | 13 → 13 (+0.0%)            | 42.65ms → 42.19ms (-1.1%)      | 60.65ms → 60.62ms (-0.0%)      | 554.42ms → 548.52ms (-1.1%)    | 14.31% → 14.19% (-0.8%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| query.artifact.batch.parallel_prepare    | 13 → 13 (+0.0%)            | 33.82ms → 33.61ms (-0.6%)      | 47.97ms → 48.37ms (+0.8%)      | 439.71ms → 436.89ms (-0.6%)    | 11.35% → 11.31% (-0.4%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| query.artifact.batch.postings.ngram_rows | 13 → 13 (+0.0%)            | 33.59ms → 33.49ms (-0.3%)      | 47.25ms → 45.58ms (-3.5%)      | 436.63ms → 435.43ms (-0.3%)    | 11.27% → 11.27% (+0.0%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| code_index.build.assemble                | 2 → 2 (+0.0%)              | 195.02ms → 196.45ms (+0.7%)    | 205.39ms → 206.57ms (+0.6%)    | 390.05ms → 392.89ms (+0.7%)    | 10.07% → 10.17% (+1.0%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| code_index.chunk.build                   | 276 → 276 (+0.0%)          | 1.35ms → 1.32ms (-2.2%)        | 1.98ms → 1.90ms (-4.0%)        | 373.03ms → 364.47ms (-2.3%)    | 9.63% → 9.43% (-2.1%)        |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+

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