Fix local-folder content decoding and strict query scoping

[arlanrakh]

What this fixes

This PR addresses a local-folder retrieval/search regression where indexed local markdown could come back garbled and local-only queries could include public-source snippets.

Changes

• Added local-folder ID resolution in nia search query before dispatch:
  • Resolves --local-folders / nia.json local bindings via sources.resolve(..., "local_folder")
  • Uses canonical source IDs when available for stricter backend scoping
  • Keeps unresolved identifiers as fallback for compatibility
• Extended experimental payload builder to support explicit source IDs ({ id: ... }) alongside typed identifiers.
• Added response normalization in CLI SDK for local-folder paths:
  • sources.content: decode base64 / encoded local content into UTF-8 text
  • sources.grep: decode encoded local-folder match text
  • search.query: decode local-folder snippet content and enforce local-only filtering when request scope is local-folder only (filters out non-local snippets/readySources/blockedSources)

Validation

• bun run check
• bun run check:types
• bun test tests/services/cli-sdk.test.ts tests/commands/search.test.ts

All pass on this branch.

  

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Summary by cubic

Fixes garbled local-folder content and stops non-local results from appearing in local-only searches. Adds strict scoping by resolving local-folder identifiers to canonical IDs.

• Bug Fixes

  • Decode base64/JSON-encoded local-folder text across sources.content, sources.grep, and search.query for both experimental and legacy paths.
  • Resolve --local-folders/nia.json bindings to canonical source IDs and include them in experimental payloads via { id: ... } (fallback to identifiers if unresolved).
  • Enforce local-only filtering in search.query by dropping non-local snippets and non-local entries in readySources/blockedSources.

• Refactors

  • Format SDK and tests to satisfy Biome lint.

^{Written for commit ebb7b58. Summary will update on new commits.}

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