refactor(sessions): extract retained owners from the root crate

[ScriptedAlchemy]

Moves retained session/LCM execution into session runtime and retained memory execution into store runtime, leaving the root crate responsible for assembling the selected authorities. Removes the redundant direct profile/session forwarding wrappers.

Profile session storage is acquired lazily inside admitted, bounded execution. A broken session store therefore does not disable unrelated memory requests; expired or cancelled requests do not acquire session storage. Exact registered project/store identity and the canonical enrollment helper are preserved.

Integrates the current #707 maintenance and replay owners, including the canonical store-runtime shutdown receipt and dependency direction.

Validation: 18 retained-runtime tests, six root retained-owner journeys, and strict Clippy passed for the corrected extraction. After merging #707 at 0b5ccfd, the six root journeys pass again; the focused real broken-session/healthy-memory regression also passes (one test). Formatting and diff checks pass. No claim of full platform or native-semantic qualification.

Part of #707; addresses the retained-owner portion of #1073 and #1088.

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	⚠️ Failed 2026-09-09T18:42:29.611795Z	04cb5f3	PR opened

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[github-actions]

Performance Comparison codex/tracedecay-total-redesign-plan-reopened → grok/w2-retained-owners

Total Elapsed Time: 3.93s → 3.91s (-0.5%)
CPU Baseline: 90.44µs → 91.56µs (+1.2%)
Benchmark ID: index-bench-timing

timing - Execution duration of functions.

+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| Function                                 | Calls                      | Avg                            | P95                            | Total                          | % Total                      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| tracedecay-index-bench                   | 1 → 1 (+0.0%)              | 3.93s → 3.91s (-0.5%)          | 3.93s → 3.92s (-0.3%)          | 3.93s → 3.91s (-0.5%)          | 100.00% → 100.00% (+0.0%)    |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| query.artifact.append_pages              | 13 → 13 (+0.0%)            | 119.75ms → 119.04ms (-0.6%)    | 164.23ms → 162.66ms (-1.0%)    | 1.56s → 1.55s (-0.6%)          | 39.58% → 39.54% (-0.1%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| code_index.workers.install               | 83 → 83 (+0.0%)            | 13.38ms → 13.25ms (-1.0%)      | 46.30ms → 46.10ms (-0.4%)      | 1.11s → 1.10s (-0.9%)          | 28.24% → 28.10% (-0.5%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| domain.canonical.sha256                  | 110414 → 110414 (+0.0%)    | 8.69µs → 8.74µs (+0.6%)        | 11.36µs → 11.42µs (+0.5%)      | 959.65ms → 965.59ms (+0.6%)    | 24.40% → 24.67% (+1.1%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| code_index.build.and_publish             | 2 → 2 (+0.0%)              | 444.14ms → 447.27ms (+0.7%)    | 505.94ms → 511.44ms (+1.1%)    | 888.27ms → 894.53ms (+0.7%)    | 22.58% → 22.86% (+1.2%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| query.artifact.batch.sqlite              | 13 → 13 (+0.0%)            | 68.06ms → 68.01ms (-0.1%)      | 92.93ms → 92.27ms (-0.7%)      | 884.80ms → 884.08ms (-0.1%)    | 22.50% → 22.59% (+0.4%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| query.artifact.batch.postings            | 13 → 13 (+0.0%)            | 59.90ms → 59.80ms (-0.2%)      | 83.69ms → 82.25ms (-1.7%)      | 778.67ms → 777.35ms (-0.2%)    | 19.80% → 19.86% (+0.3%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| query.artifact.finalization.advance_wake | 14 → 14 (+0.0%)            | 43.95ms → 43.22ms (-1.7%)      | 274.73ms → 268.30ms (-2.3%)    | 615.31ms → 605.04ms (-1.7%)    | 15.64% → 15.46% (-1.2%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| code_index.chunk.index_file              | 276 → 276 (+0.0%)          | 2.17ms → 2.11ms (-2.8%)        | 3.02ms → 2.95ms (-2.3%)        | 599.21ms → 582.49ms (-2.8%)    | 15.23% → 14.88% (-2.3%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| query.artifact.prepare_pages             | 13 → 13 (+0.0%)            | 42.79ms → 42.09ms (-1.6%)      | 60.65ms → 60.56ms (-0.1%)      | 556.32ms → 547.12ms (-1.7%)    | 14.14% → 13.98% (-1.1%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| code_index.extract.parser_artifact       | 276 → 276 (+0.0%)          | 1.86ms → 1.89ms (+1.6%)        | 2.89ms → 2.89ms (+0.0%)        | 514.33ms → 522.45ms (+1.6%)    | 13.08% → 13.35% (+2.1%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| query.artifact.batch.postings.ngram_rows | 13 → 13 (+0.0%)            | 33.11ms → 33.25ms (+0.4%)      | 45.15ms → 45.61ms (+1.0%)      | 430.45ms → 432.30ms (+0.4%)    | 10.94% → 11.05% (+1.0%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| query.artifact.batch.parallel_prepare    | 13 → 13 (+0.0%)            | 33.45ms → 32.87ms (-1.7%)      | 47.42ms → 47.42ms (+0.0%)      | 434.85ms → 427.33ms (-1.7%)    | 11.06% → 10.92% (-1.3%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| code_index.build.assemble                | 2 → 2 (+0.0%)              | 206.37ms → 208.39ms (+1.0%)    | 215.22ms → 218.76ms (+1.6%)    | 412.75ms → 416.77ms (+1.0%)    | 10.49% → 10.65% (+1.5%)      |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+
| code_index.chunk.build                   | 276 → 276 (+0.0%)          | 1.27ms → 1.28ms (+0.8%)        | 1.83ms → 1.81ms (-1.1%)        | 351.35ms → 352.47ms (+0.3%)    | 8.93% → 9.01% (+0.9%)        |
+------------------------------------------+----------------------------+--------------------------------+--------------------------------+--------------------------------+------------------------------+

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