fix(javascript): retain unresolved network targets with provenance

Resolve stable lexical and URL targets using shared effects, and preserve unresolved request expressions as partial facts. Carry their uncertainty through workers, artifact graphs, and the CLI. Scope partial endpoint identity to the source site.

Refs: #3451, #3534

Co-authored-by: Hemang Varshney <218273197+hemv-857@users.noreply.github.com>

docs/javascript-application-workflows.md

@@ -174,8 +174,10 @@ graph and read literal values from `properties.value`, rather than decoding
 role keys or labels. Previously stored graphs and their original IDs remain
 valid inputs.
 
-Endpoint nodes keep the exact endpoint in each observation's `properties.value`;
-semantic request and response nodes keep it in `properties.endpoint`. Endpoint
+Endpoint observations keep their value in `properties.value`. When
+`properties.resolution` is `partial`, that value is the unresolved source
+expression, with an identity distinct from an exact endpoint of the same text.
+Semantic request and response nodes keep their endpoint in `properties.endpoint`. Endpoint
 lookup identities are preserved independently of the primitive-value lattice's
 byte budget. An oversized normalized literal can become unknown while the same
 string remains an exact endpoint for tracing and comparison. Endpoint