Audit sequence identity scaling and lifecycle

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Sequence Identity And Combination Implementation Plan
 
-Status: implementation in progress; Stages 1–29 complete.
+Status: all thirty stages complete.
 
 Audience: a Luna coding agent implementing one numbered stage per prompt, in
 order. This plan starts at commit
@@ -1031,6 +1031,37 @@ from Stages 28–29 if their covered content is unchanged. Record completed scop
 validation, benchmark commands/qualitative findings, and any real remaining
 issues accurately. No new timing thresholds or release gates are introduced.
 
+**Completion:** Audited the shared indexed sequence-combination and identity
+validation paths, declaration gathering, numeric normalization, ownership and
+selector-path handling, adapters, dependencies, boundaries, and limits. Removed
+per-declaration temporary-slice allocation while retaining detached declaration
+ownership. Added a mixed-size identified-sequence upsert benchmark because the
+existing assembly benchmarks did not exercise this path. Its allocations grew
+roughly in proportion to record count from 128 to 2,048 records; elapsed times
+were similarly proportional in this short run and are descriptive only.
+
+Benchmark command:
+
+```sh
+go test ./internal/engine -run '^$' -bench '^(BenchmarkComposeWideMappings|BenchmarkUnderlay(BroadCatalog|ManySmallTiers)|BenchmarkOverlay(RecursiveMappings|ManyApplications)|BenchmarkInheritance(Expansion|IndependentScopes)|BenchmarkSequenceMixedUpsert)$' -benchmem -benchtime=100ms
+```
+
+The benchmark reported mixed-upsert results of 278,009 B and 2,337 allocations
+per operation at 128 records; 1,122,177 B and 9,253 allocations at 512; and
+4,521,839 B and 36,925 allocations at 2,048. No thresholds are implied. The
+code review found shared combination and identity algorithms, indexed matching
+and mapping access, declaration grouping by destination, coefficient/exponent
+numeric normalization without magnitude expansion, operation-local ownership
+and selector traversal, no remaining early-CLI adapter, and no newly introduced
+dependencies, public internal types, background work, release machinery, or
+sequence-specific resource limits. Obsolete registration names remain only in
+historical or roadmap text.
+
+Verified with `./scripts/check.sh`, `go test -race ./...`,
+`go test . -run 'TestLocalDocumentationLinks|TestDependencyImportBoundary|TestPublicFacadeBoundary' -count=1`,
+`git diff --check`, and the benchmark command above. No remaining implementation
+issues were found.
+
 Acceptance: all roadmap operations and lifecycle boundaries work through ordinary
 and layered loads; values and inspection agree; application constraints hold on
 successful final results; deferred behavior and YAML-only guarantees have not