feat: add partial SIDC decomposition

[the-Drunken-coder]

Summary

• Extend explainSidc with a curated/partial result union and explicit per-field coverage.
• Return partial decomposition for renderable non-curated number SIDCs using milsymbol metadata plus the existing curated function-ID labels.
• Document the new behavior and add focused tests for curated, partial, unsupported, invalid, and unknown-field cases.

Validation

• npm test
• npm pack --dry-run

Scope limits

• Partial decomposition is limited to affiliation, symbol set, status, domain, echelon, and entity.
• Entity labels are only provided when the function ID already appears in the curated fixture table; unknown function IDs are reported through unknownFields.
• The change does not add a broad MIL-STD-2525 or APP-6 standards table and does not make standards-compliance claims beyond milsymbol renderability.

Greptile Summary

This PR expands SIDC explanation beyond the curated fixture set. The main changes are:

• Partial decomposition for renderable non-curated number SIDCs.
• Per-field coverage and unknownFields in explain results.
• Tests for curated, partial, unsupported, invalid, and unknown-field cases.
• README updates that describe the new explain behavior and scope limits.

Confidence Score: 5/5

The SIDC explanation paths exercised by the package contract behave as described.

No code issues were identified in the finalized review. Runtime validation showed the intended base-to-head behavior change for partial decomposition, unknown field reporting, invalid and unsupported handling, and the requested package validation commands completed successfully.

None.

T-Rex Logs

What T-Rex did

• The baseline behavior showed that the base implementation rejects non-curated renderable SIDCs with UNSUPPORTED_SIDC and the curated output has no fields or unknownFields.
• After the change, the head implementation returns coverage=partial for the renderable non-curated infantry SIDC with known field coverage.
• The system now reports unknownFields=["entity"] for an unknown function ID.
• The system rejects unsupported SIDCs as UNSUPPORTED_SIDC.
• The system rejects invalid input as INVALID_SIDC.
• npm test and npm pack --dry-run pass.

_{Ran code and verified through T-Rex}

_{Reviews (2): Last reviewed commit: "fix: tighten partial SIDC coverage" | Re-trigger Greptile}

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: faeb64a5-36f5-4d21-87c2-efcd82523a65

📥 Commits

Reviewing files that changed from the base of the PR and between 3b6285b and b219a74.

📒 Files selected for processing (3)

• README.md
• src/index.ts
• test/sidc-kit.test.mjs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/richer-sidc-decomposition

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[the-Drunken-coder]

@codex review

[the-Drunken-coder]

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