[Danny Ward (dannyward630)]

Summary

• Keep {{named-value}} references available to named-value discovery without requesting them as literal backends.
• Skip APIM expression backend IDs (@(...) and @{...}) during transitive backend discovery.
• Add resolver and extractor regression coverage while preserving literal backend handling.

Validation

• npm run lint — passed
• npm run build — passed
• npm test — passed (1,650 passed, 2 skipped)
• Independent CodeReviewer review — approved with no findings

Related Issue(s)

Closes #331

Assisted by Codex (GPT-6).

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[Copilot]

🟢 Approval recommended

The focused fix preserves literal backend handling and includes targeted regression coverage, with no unresolved issues identified.

No open issues 🎉

What changed in this PR

Fixes #331 by excluding named-value placeholders and APIM expressions from literal backend discovery, preventing false backend requests during extraction.

Changes:

• Filters nonliteral backend IDs while preserving literal backend handling.
• Keeps named-value references available for discovery.
• Adds resolver and extractor regression tests for the reported failure.

File	Description
tests/​unit/​services/​transitive-resolver.test.ts	Tests exclusion of placeholders and expressions from backend references.
tests/​unit/​services/​transitive-extractor.test.ts	Tests named-value extraction without requesting the placeholder as a backend.
src/​services/​transitive-resolver.ts	Adds a literal-backend-ID check before registering backend dependencies.

_{Review effort: Balanced}