refactor(maintenance): extract store kernels and tick policy from root

[ScriptedAlchemy]

Move maintenance kernels into their owning crates while keeping one canonical enrollment identity implementation. Retention, lifecycle, and selected-memory callers now use the same policy. Degraded maintenance outcomes retain warning-level visibility under the default log filter.

The corrected head preserves existing cancellation and durability behavior. Validation: two enrollment regressions, three selected-memory authorization/isolation journeys, and one real WARN/INFO subscriber test pass (cc-12932/12935/12933). Strict runtime-core, maintenance, and root library/test Clippy passes without warnings (cc-12934).

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-09T18:37:24.715172Z	f27db40	PR opened

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[chatgpt-codex-connector]

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Reviewed commit: f27db40b33

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[github-actions]

Performance Comparison codex/tracedecay-total-redesign-plan-reopened → grok/w2-maintenance-kernels

Total Elapsed Time: 3.95s → 4.27s (+8.1%)
CPU Baseline: 87.12µs → 81.42µs (-6.5%)
Benchmark ID: index-bench-timing

timing - Execution duration of functions.

+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| Function                                 | Calls                      | Avg                             | P95                             | Total                            | % Total                      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| tracedecay-index-bench                   | 1 → 1 (+0.0%)              | 3.95s → 4.27s (+8.1%)           | 3.95s → 4.27s (+8.1%)           | 3.95s → 4.27s (+8.1%)            | 100.00% → 100.00% (+0.0%)    |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.append_pages              | 13 → 13 (+0.0%)            | 120.98ms → 133.30ms (+10.2%)    | 160.83ms → 186.91ms (+16.2%)    | 1.57s → 1.73s (+10.2%)           | 39.84% → 40.60% (+1.9%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| code_index.workers.install               | 83 → 83 (+0.0%)            | 14.14ms → 15.55ms (+10.0%)      | 47.45ms → 59.08ms (+24.5%) ⚠️   | 1.17s → 1.29s (+10.3%)           | 29.74% → 30.23% (+1.6%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| domain.canonical.sha256                  | 110414 → 110414 (+0.0%)    | 9.34µs → 9.38µs (+0.4%)         | 12.62µs → 12.72µs (+0.8%)       | 1.03s → 1.04s (+1.0%)            | 26.13% → 24.28% (-7.1%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| code_index.build.and_publish             | 2 → 2 (+0.0%)              | 459.75ms → 474.71ms (+3.3%)     | 532.15ms → 547.88ms (+3.0%)     | 919.50ms → 949.42ms (+3.3%)      | 23.29% → 22.24% (-4.5%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.sqlite              | 13 → 13 (+0.0%)            | 69.30ms → 72.34ms (+4.4%)       | 91.42ms → 98.17ms (+7.4%)       | 900.86ms → 940.42ms (+4.4%)      | 22.82% → 22.03% (-3.5%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.postings            | 13 → 13 (+0.0%)            | 60.68ms → 63.18ms (+4.1%)       | 81.00ms → 85.85ms (+6.0%)       | 788.80ms → 821.36ms (+4.1%)      | 19.98% → 19.24% (-3.7%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.finalization.advance_wake | 14 → 14 (+0.0%)            | 43.57ms → 49.21ms (+12.9%)      | 271.84ms → 309.07ms (+13.7%)    | 609.93ms → 688.87ms (+12.9%)     | 15.45% → 16.14% (+4.5%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.prepare_pages             | 13 → 13 (+0.0%)            | 43.64ms → 51.34ms (+17.6%)      | 61.54ms → 78.84ms (+28.1%) ⚠️   | 567.34ms → 667.43ms (+17.6%)     | 14.37% → 15.64% (+8.8%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| code_index.chunk.index_file              | 276 → 276 (+0.0%)          | 2.22ms → 2.35ms (+5.9%)         | 3.20ms → 3.35ms (+4.7%)         | 611.55ms → 649.16ms (+6.1%)      | 15.49% → 15.21% (-1.8%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| code_index.extract.parser_artifact       | 276 → 276 (+0.0%)          | 2.05ms → 2.12ms (+3.4%)         | 3.09ms → 3.23ms (+4.5%)         | 565.89ms → 584.40ms (+3.3%)      | 14.34% → 13.69% (-4.5%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.parallel_prepare    | 13 → 13 (+0.0%)            | 34.65ms → 41.92ms (+21.0%) ⚠️   | 48.79ms → 65.60ms (+34.5%) ⚠️   | 450.42ms → 544.91ms (+21.0%) ⚠️  | 11.41% → 12.77% (+11.9%)     |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.postings.ngram_rows | 13 → 13 (+0.0%)            | 34.06ms → 35.23ms (+3.4%)       | 46.14ms → 48.43ms (+5.0%)       | 442.74ms → 458.04ms (+3.5%)      | 11.22% → 10.73% (-4.4%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| code_index.build.assemble                | 2 → 2 (+0.0%)              | 204.58ms → 209.53ms (+2.4%)     | 212.99ms → 218.37ms (+2.5%)     | 409.16ms → 419.07ms (+2.4%)      | 10.37% → 9.82% (-5.3%)       |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| code_index.chunk.build                   | 276 → 276 (+0.0%)          | 1.39ms → 1.44ms (+3.6%)         | 1.99ms → 2.08ms (+4.5%)         | 384.63ms → 397.50ms (+3.3%)      | 9.74% → 9.31% (-4.4%)        |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+

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