Verify layered resolution provenance

docs/roadmap/implementation.md

@@ -167,7 +167,7 @@ Stage 2 risks were identified.
 
 ## Stage 3 — Verify layered provenance and snapshot independence
 
-Status: not started. Dependencies: Stage 2.
+Status: complete (2026-09-12). Dependencies: Stage 2.
 
 Scope: public lifecycle/provenance, import/profile/override, and ownership tests;
 production fixes only for gaps exposed at those boundaries.
@@ -202,6 +202,20 @@ is introduced. Any discovered defect is fixed before the stage is marked complet
 Validation: `go test . -run 'Resolution|Provenance|Import|Profile|Override|Metadata|Path'`,
 `go test -race ./...`, then the everyday checker.
 
+Completion record (2026-09-12): public lifecycle tests now build real temporary
+main/import/profile graphs and prove scalar, sequence, composite-container,
+profile, and equal-text CLI provenance through `InputInfo`/`Source`, deriving source
+IDs from returned locations. Coverage also exercises byte and reader roots with
+filesystem imports, a standalone non-file root, retained defaults, unknown IDs,
+typed/inlined/map/array/dynamic shape matching, signed mapping keys, and invalid
+sequence shapes. Recorded normalization, deletion, addition, and move operations
+leave entry queries fixed while final metadata reflects resolution. Returned records,
+completed results, another load, and concurrent independent loads remain detached.
+No production gap was exposed. `go test . -run
+'Resolution|Provenance|Import|Profile|Override|Metadata|Path'`, `go test -race
+./...`, and `./scripts/check.sh` passed with Go 1.26.7 on Linux. No deviations or
+remaining Stage 3 risks were identified.
+
 ## Stage 4 — Demonstrate source-aware normalization and safe inspection
 
 Status: not started. Dependencies: Stage 3.