feat(ts): convert config + util to TypeScript (Phase 3)

[graphanov]

Summary

• Converts the Phase 3 config/util boundary from JavaScript to TypeScript.

Scope

• src/config.js and src/util.js are renamed to .ts with explicit types; PersistedUserConfig is shared from src/types/index.ts; affected tests import compiled dist modules after build.

Out of scope

• No merge, publish, release, version bump, workflow, secret, or forbidden-path changes.

Verification

• npx tsc --noEmit → 0 errors; npm run build → passed; node --test test/*.test.mjs → 445 pass / 0 fail.

Risk

• Low: scoped TypeScript rename plus type annotations; behavior covered by existing config/util-adjacent tests.

Linked issue

Closes #51

Authority boundary

john-lomein did not merge, publish, release, dispatch workflows, change settings, force-push, rewrite history, or touch secrets.

[graphanov]

@codex review

[graphanov]

Status: ready for review on latest head.

Evidence:

• Head d46c1d1 on forge/issue-51-config-util-typescript is mergeable/CLEAN; CI ci → pass; reviewThreads → 0; forbidden paths → none; local verification: npx tsc --noEmit → 0 errors, npm run build → passed, node --test test/*.test.mjs → 445 pass / 0 fail; Codex review trigger already posted for this head.

Next: Marking PR ready for review. Owner gate still required before merge/publish/release; no gated side effect taken.

[chatgpt-codex-connector]

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

Reviewed commit: d46c1d1f94

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[graphanov]

APPROVE JOHN-LOMEIN BUNDLE lazyglm-59-d46c1d1f: merge listed PRs only; do not publish.