feat: add reverse lookup v0

[the-Drunken-coder]

Summary

• Add identifySymbol(input, options?) for deterministic reverse lookup against curated milsymbol SVG renderings.
• Return ranked candidates with confidence and evidence instead of a single guessed SIDC.
• Document the v0 scope as clean inline SVG or percent-encoded SVG data URL comparison only.

Validation

• npm test
• npm pack --dry-run

Scope limits

• No screenshot, photo, scan, raster PNG/JPEG, cropped-symbol, map-marker-composite, or arbitrary icon recognition.
• No exhaustive MIL-STD-2525/APP-6 corpus matching; lookup remains limited to the curated fixture set.
• No new runtime dependency.

Greptile Summary

This PR adds deterministic reverse lookup for curated clean SVG symbols. The main changes are:

• New identifySymbol(input, options?) API with ranked candidates.
• SVG and SVG data URL normalization before matching.
• Similarity scoring with confidence thresholds and result limits.
• Tests and README coverage for the new reverse lookup scope.

Confidence Score: 5/5

The reverse lookup API behavior is implemented and exercised for the documented clean SVG inputs.

No code issues were identified. The implementation adds the expected export, returns ranked candidates with confidence and evidence, supports inline SVG and percent-encoded SVG data URLs, and the package validation commands complete successfully.

None.

T-Rex Logs

What T-Rex did

• Reviewed the before-state log trex-artifacts/reverse-lookup-contract-01-before.log and confirmed that base exported keys exclude identifySymbol and the reverse lookup call is unavailable.
• Reviewed the after-state log trex-artifacts/reverse-lookup-contract-02-after.log and confirmed that inline SVG returns four ranked curated candidates with top SIDC confidence 1 and normalized-svg evidence, and that the percent-encoded data URL returns the matching curated SIDC with confidence 1; tests pass and the pack dry-run succeeds.

_{Ran code and verified through T-Rex}

_{Reviews (2): Last reviewed commit: "fix: avoid unnecessary reverse lookup sc..." | Re-trigger Greptile}

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: fc9b912a-9618-4bff-8d1c-984f75705deb

📥 Commits

Reviewing files that changed from the base of the PR and between 3b6285b and 501bf65.

📒 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/reverse-lookup-v0

---

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[the-Drunken-coder]

@codex review

[the-Drunken-coder]

@greptileai review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Hooray!

Reviewed commit: 54dbdd79f2

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