feat(hotpath): fill usecases stream/emit/semantic-config gaps

[ScriptedAlchemy]

Summary

• Gap-fill hotpath instrumentation PR scoped to crates/tracedecay-usecases only (HP-usecases). Adds 111 new measure sites (102 #[hotpath::measure] attributes, 9 hotpath::future! wraps of boxed port futures) across 14 files.
• Targets the previously uninstrumented hot files (operation_stream.rs, observability emit/producer lanes, semantic config store/operation, diagnostics publication, vector generation store, advisory GitHub/CI stores) plus add-missing-only sites in semantic_runtime/production.rs, diagnostics_store.rs, and feedback/concrete.rs.
• No existing measure sites were touched, no Cargo.toml changes, no feature wiring changes. Macros no-op without --features hotpath; the feature stays out of default/production. The hook-protocol metrics-server guard is untouched. Does not merge feat: consolidate TraceDecay V2 PR8-PR13 delivery #707.

Motivation

Coverage inventory showed 68/340 async fns measured and ~84 files with no hotpath sites in tracedecay-usecases. This fills the highest-value gaps (usecase entrypoints, durable store read/write paths, emit lanes) so opt-in profiling sees the full request path.

Changes

File	New sites	New labels
src/operation_stream.rs	12	usecases.operation.{begin, begin_test_run, cancel, cancel_test_run, subscribe, expire_all, resolve_context, read_test_run, page_test_run, emit_progress, emit_test_result, emit_terminal}
src/observability/retrieval_emit.rs	9	usecases.observability.{emit_pipeline, observe_ablation, record_planner, record_retriever, record_synthesis, record_source, record_context_outcome, record_ablation, record_consent}
src/observability/emit.rs	8	usecases.observability.{record_query, record_adoption_eligibility, record_adoption_outcome, record_latency, record_operation_resource, record_storage, record_index, emit_index}
src/observability/producer.rs	4	usecases.observability.{try_emit, producer_stop, persist_queued, persist_envelope}
src/semantic_runtime/config_store.rs	9	usecases.semantic_config.{install_initial, read_committed, read_present, read_profile, read_committed_profile, preview_mutation, stage_activation, stage_rollback, persist_pending}
src/semantic_runtime/configuration_operation.rs	8	usecases.semantic_config.{commit_publication, qualify_profile, evaluate_publish, activate, rollback, prepare_activation, validate_snapshot, read_state}
src/diagnostics_publication.rs	6	usecases.diagnostics.{contribute, publish_snapshot, resolve_compiler, load_project_file, publish_compiler, publish_compiler_indexed}
src/store/vector_generations.rs	11	usecases.vector.{begin_generation, rebuild_generation, commit_batch, validate_batch, apply_batch, publish_generation, persist_sealed, reopen_sealed, intern_vectors, hydrate_values, sweep_retired}
src/advisory/github_runtime/store.rs	5	usecases.advisory.github.{load_manifest, load_inventory, load_entry, load_state, record_refresh}
src/advisory/github_runtime/anchors.rs	9	usecases.advisory.github.{resolve_seeds, resolve_stored_seed, resolve_new_seed, remap_original, remap_seed, load_anchor, persist_anchor, persist_body, read_body}
src/advisory/ci_runtime/stores.rs	6	usecases.advisory.ci.{load_inventory, load_entry, load_manifest, load_record, retain_observation, resolve_code_anchor}
src/semantic_runtime/production.rs	6	usecases.semantic.{restore_current, prepare_restore, revalidate_target, active_generation, execute_search, inspect_eval_snapshot}
src/diagnostics_store.rs	6	usecases.diagnostics_store.{immediate_tx, insert_record, publication_state, query_generation, find_successor, collect_rows}
src/feedback/concrete.rs	12	usecases.feedback.{read_diagnostics, read_get, read_expand, read_list, close_drain, load_publications, doctor_latest, record_publication, observation_read_model, persist_observation, persist_boot, load_ledger}

Non-obvious bits:

• Port-trait methods returning FeedbackPortFuture<'a, _> (boxed futures) cannot take the attribute macro, so they are wrapped as Box::pin(hotpath::future!(async move { ... }, label = "...")), the same pattern already used in feedback/cycle_production.rs and feedback/cycle_runtime.rs.
• commit_batch is measured on commit_batch_ref (the shared implementation) so the public wrapper and the persistent adapter path are both covered by one span without double counting.
• All 111 labels are unique and verified against the existing tree (no collisions with pre-existing labels). Skipped: getters, Display impls, serde/DTO glue, test modules, and long-lived worker loops (run_worker/settle_worker — per-iteration persistence is measured instead).
• hotpath::future! is used without any hotpath/tokio passthrough, matching existing usage in this crate; no tokio_runtime! was introduced.

Test plan

• cargo check -p tracedecay-usecases (default features) passes
• cargo check -p tracedecay-usecases --features tracedecay-usecases/hotpath passes
• cargo clippy -p tracedecay-usecases --all-targets --features tracedecay-usecases/hotpath exits 0 (single pre-existing manual_ok_err warning in benches/semantic_vector_commit_scale.rs, untouched by this PR)
• cargo nextest run --workspace --no-fail-fast (not run here; instrumentation is behavior-neutral without the feature)

Checklist

• No secrets, credentials, or .env files included
• Breaking changes documented (none — macros no-op without the opt-in feature)
• CHANGELOG.md updated (not updated: instrumentation-only change with no user-facing behavior; can add on request)

  

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[github-actions]

Performance Comparison codex/tracedecay-total-redesign-plan-reopened → cursor/hotpath-gap-fill-2db4

Total Elapsed Time: 5.36s → 5.14s (-4.1%)
CPU Baseline: 89.75µs → 89.95µs (+0.2%)
Benchmark ID: index-bench-timing

timing - Execution duration of functions.

+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| Function                                 | Calls                      | Avg                             | P95                              | Total                            | % Total                      |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| tracedecay-index-bench                   | 1 → 1 (+0.0%)              | 5.36s → 5.14s (-4.1%)           | 5.36s → 5.14s (-4.1%)            | 5.36s → 5.14s (-4.1%)            | 100.00% → 100.00% (+0.0%)    |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| query.artifact.append_pages              | 13 → 13 (+0.0%)            | 180.47ms → 184.35ms (+2.1%)     | 242.88ms → 266.60ms (+9.8%)      | 2.35s → 2.40s (+2.1%)            | 43.79% → 46.63% (+6.5%)      |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.sqlite              | 13 → 13 (+0.0%)            | 122.39ms → 122.32ms (-0.1%)     | 167.12ms → 172.49ms (+3.2%)      | 1.59s → 1.59s (+0.0%)            | 29.70% → 30.94% (+4.2%)      |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.postings            | 13 → 13 (+0.0%)            | 107.57ms → 106.84ms (-0.7%)     | 147.98ms → 147.72ms (-0.2%)      | 1.40s → 1.39s (-0.7%)            | 26.10% → 27.02% (+3.5%)      |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| code_index.workers.install               | 83 → 83 (+0.0%)            | 18.75ms → 16.02ms (-14.6%)      | 52.46ms → 57.51ms (+9.6%)        | 1.56s → 1.33s (-14.7%)           | 29.04% → 25.88% (-10.9%)     |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| CodeIndexProductionOwnerV1::extract_file | 276 → 276 (+0.0%)          | 5.92ms → 4.51ms (-23.8%) 🚀     | 12.98ms → 6.75ms (-48.0%) 🚀     | 1.63s → 1.24s (-23.9%) 🚀        | 30.47% → 24.21% (-20.5%) 🚀  |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| code_index.build.and_publish             | 2 → 2 (+0.0%)              | 613.74ms → 505.51ms (-17.6%)    | 643.83ms → 507.77ms (-21.1%) 🚀  | 1.23s → 1.01s (-17.9%)           | 22.91% → 19.67% (-14.1%)     |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| domain.canonical.sha256                  | 114526 → 114526 (+0.0%)    | 10.87µs → 8.48µs (-22.0%) 🚀    | 14.09µs → 13.91µs (-1.3%)        | 1.24s → 970.95ms (-21.7%) 🚀     | 23.23% → 18.89% (-18.7%)     |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| query.artifact.finalization.advance_wake | 14 → 14 (+0.0%)            | 52.56ms → 55.57ms (+5.7%)       | 261.75ms → 282.33ms (+7.9%)      | 735.83ms → 778.01ms (+5.7%)      | 13.73% → 15.14% (+10.3%)     |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| query.artifact.prepare_pages             | 13 → 13 (+0.0%)            | 48.48ms → 52.41ms (+8.1%)       | 66.78ms → 81.72ms (+22.4%) ⚠️    | 630.21ms → 681.38ms (+8.1%)      | 11.76% → 13.26% (+12.8%)     |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| code_index.chunk.index_file              | 276 → 276 (+0.0%)          | 2.67ms → 2.08ms (-22.1%) 🚀     | 5.91ms → 3.09ms (-47.7%) 🚀      | 736.45ms → 573.97ms (-22.1%) 🚀  | 13.74% → 11.17% (-18.7%)     |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| query.artifact.batch.parallel_prepare    | 13 → 13 (+0.0%)            | 38.16ms → 42.07ms (+10.2%)      | 52.46ms → 68.42ms (+30.4%) ⚠️    | 496.04ms → 546.89ms (+10.3%)     | 9.26% → 10.64% (+14.9%)      |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| code_index.extract.parser_artifact       | 276 → 276 (+0.0%)          | 2.41ms → 1.90ms (-21.2%) 🚀     | 5.81ms → 2.83ms (-51.3%) 🚀      | 663.87ms → 523.23ms (-21.2%) 🚀  | 12.39% → 10.18% (-17.8%)     |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| 🆕 code_index.build.assemble             | 0 → 2 (+100.0%) ⚠️         | 0.00ns → 187.76ms (+100.0%) ⚠️  | 0.00ns → 200.54ms (+100.0%) ⚠️   | 0.00ns → 375.52ms (+100.0%) ⚠️   | 0.00% → 7.31% (+100.0%) ⚠️   |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| code_index.chunk.build                   | 276 → 276 (+0.0%)          | 1.59ms → 1.26ms (-20.8%) 🚀     | 4.34ms → 1.82ms (-58.1%) 🚀      | 438.89ms → 348.69ms (-20.6%) 🚀  | 8.19% → 6.78% (-17.2%)       |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+
| 🗑️ code_index.build.materialize_full     | 1 → 0 (-100.0%) 🚀         | 438.32ms → 0.00ns (-100.0%) 🚀  | 438.57ms → 0.00ns (-100.0%) 🚀   | 438.32ms → 0.00ns (-100.0%) 🚀   | 8.18% → 0.00% (-100.0%) 🚀   |
+------------------------------------------+----------------------------+---------------------------------+----------------------------------+----------------------------------+------------------------------+

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