feat(hotpath): fill rusqlite-runtime execute/query gaps

[ScriptedAlchemy]

Summary

Gap-fill hotpath instrumentation PR for crates/tracedecay-rusqlite-runtime only (HP-db-sqlite), stacked on #707. Adds 56 new #[hotpath::measure] sites on previously unmeasured SQL execution, transaction, reader-lease, and recovery-authority paths. No existing measure site was renamed, moved, or rewritten; the diff is insertions only (56 added lines, 0 removed).

• All new labels follow the crate.area.verb grammar (rusqlite.<area>.<verb>).
• No Cargo.toml changes: the crate already has the hotpath / hotpath-alloc / hotpath-cpu feature passthrough, and these features remain excluded from default and production. Without --features hotpath every macro expands to a no-op.
• No tests/benches/CI changes (separate coverage PR).
• Compile-verified: cargo check -p tracedecay-rusqlite-runtime (default) and cargo check -p tracedecay-rusqlite-runtime --features hotpath both pass, plus cargo clippy -p tracedecay-rusqlite-runtime --all-targets --features hotpath is clean. Commit subject passes lint:commit.

Files touched / new measure sites / new labels

File	New sites	New labels
src/repository/project.rs	7	rusqlite.project.fact_write, rusqlite.project.observation_write, rusqlite.project.observation_batch, rusqlite.project.remote_observation_replay, rusqlite.project.observation_cursor_advance, rusqlite.project.evidence_assembly_write, rusqlite.project.read
src/repository/diagnostics.rs	5	rusqlite.diagnostics.write, rusqlite.diagnostics.supersede, rusqlite.diagnostics.read, rusqlite.diagnostics.chain_walk, rusqlite.diagnostics.insert_record
src/repository/retrieval_anchor.rs	4	rusqlite.retrieval_anchor.disposition_write, rusqlite.retrieval_anchor.derivative_write, rusqlite.retrieval_anchor.read, rusqlite.retrieval_anchor.current_record
src/repository/configuration.rs	3	rusqlite.configuration.write, rusqlite.configuration.read, rusqlite.configuration.insert_revision
src/repository/remote.rs	3	rusqlite.remote.fence_verify_seed, rusqlite.remote.observation_event_persist, rusqlite.remote.fence_install
src/remote/recovery_authority.rs	10	rusqlite.recovery.publish_authority, rusqlite.recovery.reconcile_promotions, rusqlite.recovery.seed_authority, rusqlite.recovery.promotion_pending, rusqlite.recovery.execute_operation, rusqlite.recovery.load_writer, rusqlite.recovery.load_writer_lineage, rusqlite.recovery.promote, rusqlite.recovery.authority_state, rusqlite.recovery.persist_sink_receipts
src/reader/pool/lease.rs	8	rusqlite.reader_lease.begin_snapshot, rusqlite.reader_lease.execute, rusqlite.reader_lease.exact_sql_query, rusqlite.reader_lease.begin_exact_sql_snapshot, rusqlite.reader_lease.exact_sql_snapshot_query, rusqlite.reader_lease.store_size, rusqlite.reader_lease.table_sizes, rusqlite.reader_lease.finish_snapshot
src/reader/pool/mod.rs	3	rusqlite.reader_pool.release_memory, rusqlite.reader_pool.retire_idle, rusqlite.reader_pool.add_worker
src/exact_sql/mod.rs	9	rusqlite.exact_sql.checkpoint_wal_truncate, rusqlite.exact_sql.release_memory, rusqlite.exact_sql.repair_auto_vacuum, rusqlite.exact_sql.txn_commit, rusqlite.exact_sql.txn_rollback, rusqlite.exact_sql.txn_dispatch, rusqlite.exact_sql.attach_db, rusqlite.exact_sql.detach_db, rusqlite.exact_sql.execute_batch
src/connection/mod.rs	1	rusqlite.connection.verify_identity
src/writer.rs	2 (async, future = true)	rusqlite.writer.bounded_incremental_vacuum, rusqlite.writer.enqueue_online_backup
src/work/sql.rs	1	rusqlite.work.query

Placement notes for review

• One measurement level per call chain. Leaf executors that already carry measures (external-source, graph-publication, attachment) did not get duplicate wrappers in ProjectExecutor; conversely ProjectExecutor covers the lanes whose leaf executors are unmeasured (fact, observation, evidence assembly). Diagnostics/retrieval-anchor/configuration lanes are measured at their leaf executor files instead of the project.rs wrappers.
• Handle vs. worker spans. exact_sql transaction commit/rollback/dispatch and the writer's vacuum/backup enqueues are measured on the caller side; the existing worker-side spans (rusqlite.commit, rusqlite.exact_sql.vacuum, rusqlite.writer.online_backup) stay untouched, so the delta between the two populations exposes writer-actor queue wait, mirroring the existing begin_immediate / write_lock split documented in the code.
• submit was left unmeasured because it delegates directly to the already-measured submit_authorized; snapshot_to / snapshot_to_interruptible are covered by the shared enqueue_online_backup span.
• rusqlite.reader_lease.finish_snapshot covers the snapshot-end rollback wait including the deferred-return grace path.

Constraints honored

• Only crates/tracedecay-rusqlite-runtime changed; no other crate or workspace Cargo.toml touched.
• hotpath* features remain opt-in only (never in default/production).
• Stacked on codex/tracedecay-total-redesign-plan-reopened; feat: consolidate TraceDecay V2 PR8-PR13 delivery #707 is not merged and master is not targeted.

  

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[github-actions]

Performance Comparison codex/tracedecay-total-redesign-plan-reopened → cursor/hotpath-gap-fill-8c00

Total Elapsed Time: 5.17s → 5.70s (+10.3%)
CPU Baseline: 87.70µs → 79.48µs (-9.4%)
Benchmark ID: index-bench-timing

timing - Execution duration of functions.

+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| Function                                 | Calls                      | Avg                             | P95                             | Total                            | % Total                      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| tracedecay-index-bench                   | 1 → 1 (+0.0%)              | 5.17s → 5.70s (+10.3%)          | 5.17s → 5.70s (+10.3%)          | 5.17s → 5.70s (+10.3%)           | 100.00% → 100.00% (+0.0%)    |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.append_pages              | 13 → 13 (+0.0%)            | 181.50ms → 200.28ms (+10.3%)    | 247.86ms → 287.31ms (+15.9%)    | 2.36s → 2.60s (+10.2%)           | 45.66% → 45.69% (+0.1%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| code_index.workers.install               | 83 → 83 (+0.0%)            | 16.06ms → 20.62ms (+28.4%) ⚠️   | 53.61ms → 72.81ms (+35.8%) ⚠️   | 1.33s → 1.71s (+28.6%) ⚠️        | 25.80% → 30.03% (+16.4%)     |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.sqlite              | 13 → 13 (+0.0%)            | 124.41ms → 129.68ms (+4.2%)     | 170.52ms → 185.34ms (+8.7%)     | 1.62s → 1.69s (+4.3%)            | 31.30% → 29.58% (-5.5%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.postings            | 13 → 13 (+0.0%)            | 108.85ms → 112.99ms (+3.8%)     | 150.08ms → 164.76ms (+9.8%)     | 1.42s → 1.47s (+3.5%)            | 27.38% → 25.77% (-5.9%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| CodeIndexProductionOwnerV1::extract_file | 276 → 276 (+0.0%)          | 5.07ms → 5.26ms (+3.7%)         | 7.45ms → 9.67ms (+29.8%) ⚠️     | 1.40s → 1.45s (+3.6%)            | 27.07% → 25.47% (-5.9%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| code_index.build.and_publish             | 2 → 2 (+0.0%)              | 532.55ms → 621.35ms (+16.7%)    | 537.92ms → 635.96ms (+18.2%)    | 1.07s → 1.24s (+15.9%)           | 20.61% → 21.81% (+5.8%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| domain.canonical.sha256                  | 114526 → 114526 (+0.0%)    | 9.05µs → 10.43µs (+15.2%)       | 15.06µs → 15.14µs (+0.5%)       | 1.04s → 1.19s (+14.4%)           | 20.06% → 20.97% (+4.5%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.finalization.advance_wake | 14 → 14 (+0.0%)            | 55.49ms → 56.18ms (+1.2%)       | 282.59ms → 276.04ms (-2.3%)     | 776.81ms → 786.58ms (+1.3%)      | 15.03% → 13.80% (-8.2%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.prepare_pages             | 13 → 13 (+0.0%)            | 47.58ms → 60.49ms (+27.1%) ⚠️   | 68.55ms → 89.00ms (+29.8%) ⚠️   | 618.57ms → 786.38ms (+27.1%) ⚠️  | 11.97% → 13.80% (+15.3%)     |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| code_index.chunk.index_file              | 276 → 276 (+0.0%)          | 2.45ms → 2.46ms (+0.4%)         | 3.31ms → 4.19ms (+26.6%) ⚠️     | 675.04ms → 677.92ms (+0.4%)      | 13.06% → 11.90% (-8.9%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.parallel_prepare    | 13 → 13 (+0.0%)            | 37.32ms → 50.09ms (+34.2%) ⚠️   | 53.61ms → 75.76ms (+41.3%) ⚠️   | 485.10ms → 651.12ms (+34.2%) ⚠️  | 9.39% → 11.43% (+21.7%) ⚠️   |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| code_index.extract.parser_artifact       | 276 → 276 (+0.0%)          | 2.08ms → 2.22ms (+6.7%)         | 3.20ms → 3.31ms (+3.4%)         | 574.92ms → 613.38ms (+6.7%)      | 11.13% → 10.76% (-3.3%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| code_index.build.assemble                | 2 → 2 (+0.0%)              | 193.77ms → 222.55ms (+14.9%)    | 205.78ms → 227.80ms (+10.7%)    | 387.53ms → 445.10ms (+14.9%)     | 7.50% → 7.81% (+4.1%)        |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| 🆕 code_index.chunk.build                | 0 → 276 (+100.0%) ⚠️       | 0.00ns → 1.55ms (+100.0%) ⚠️    | 0.00ns → 2.57ms (+100.0%) ⚠️    | 0.00ns → 426.55ms (+100.0%) ⚠️   | 0.00% → 7.48% (+100.0%) ⚠️   |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+
| 🗑️ code_index.chunk.map_ordered          | 780 → 0 (-100.0%) 🚀       | 515.64µs → 0.00ns (-100.0%) 🚀  | 598.53µs → 0.00ns (-100.0%) 🚀  | 402.20ms → 0.00ns (-100.0%) 🚀   | 7.78% → 0.00% (-100.0%) 🚀   |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+----------------------------------+------------------------------+

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