docs(javascript): state that duplicate unmapped content stays ambiguous

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/javascript-runtime-reconciliation.md

@@ -108,9 +108,10 @@ nodes. REA evaluates compatible static candidates conservatively:
 6. Missing authorization mappings and incomplete or truncated input coverage
    remain unknown or truncated rather than becoming absence claims. A runtime
    location with no automatic artifact-root or caller-declared mapping into
-   any layer, and no unique content match, is `unknown` with
-   `no-authorized-location-mapping`, with or without captured bytes. Only a
-   mapped location can be `unmatched` with `no-static-content-match`.
+   any layer, and no content match, is `unknown` with
+   `no-authorized-location-mapping`, with or without captured bytes; several
+   content matches remain `ambiguous` under rule 4. Only a mapped location can
+   be `unmatched` with `no-static-content-match`.
 
 Every successful cross-layer `observed_as` edge has
 `authority: cross-layer-reconciliation` and `state: inferred`. The underlying