chore(mcp): add tsc build pipeline + convert small lib utilities to TypeScript (Phase 1 of #7291) - #7409

Summary

• Adds packages/loopover-mcp/tsconfig.json and switches the package's build script from a node --check-only chain to a real tsc compile (in-place .ts -> .js emit, import paths unchanged), plus a glob-driven scripts/check-syntax.mjs syntax-verification pass -- mirroring packages/loopover-miner's own build pipeline exactly (build:tsc && build:verify).
• Converts the four smallest, lowest-risk lib/ files to real TypeScript: cli-error.js, format-table.js, redact-local-path.js, telemetry.js.
• No published-package shape change: declaration: false (no new .d.ts artifact type) and "!lib/**/*.ts" / "!scripts/check-syntax.mjs" exclusions in package.json's files keep the npm tarball's file list byte-identical to before -- verified against test/unit/check-mcp-package.test.ts's allowlist.

Scope

• The PR title follows type(scope): short summary Conventional Commit format.
• This PR is focused and does not mix unrelated backend, UI, MCP, docs, dependency, and deploy changes.
• This follows CONTRIBUTING.md and does not reintroduce GitHub Pages, VitePress, site/, or CNAME.
• I linked a currently open issue this PR resolves.

Closes #7328

Validation

• git diff --check (against origin/main, matching CI's changes job exactly -- see Notes)
• npm run actionlint
• npm run typecheck
• npm run test:coverage locally -- 100% lines/branches/functions on all 4 converted files, including a new test/unit/mcp-cli-error.test.ts for cli-error.js (previously untested at all) and added branch-coverage tests to test/unit/format-table.test.ts.
• npm run test:workers
• npm run build:mcp
• npm run test:mcp-pack
• npm run ui:openapi:check
• npm run ui:lint
• npm run ui:typecheck
• npm run ui:build
• npm audit --audit-level=moderate
• New or changed behavior has unit/integration tests for new branches, fallback paths, and sanitizer boundaries

If any required check was skipped, explain why:

• Not skipped, but note: npm audit --audit-level=moderate reports a pre-existing high-severity adm-zip advisory (no fix available) via github-actionlint, inherited unchanged from main and unrelated to this PR's packages/loopover-mcp scope.

Safety

• No secrets, wallet details, hotkeys, coldkeys, user PATs, private keys, raw trust scores, private rankings, or private maintainer evidence are exposed.
• Public GitHub text stays sanitized, low-noise, and does not imply compensation guarantees or optimization tactics.
• Auth, cookie, CORS, GitHub App, Cloudflare, or session changes include negative-path tests. (N/A -- no such changes.)
• API/OpenAPI/MCP behavior is updated and tested where needed. (N/A -- pure internal helper refactor, no MCP tool surface changed.)
• UI changes use live API data or real empty/error/loading states, not production mock/demo fallbacks. (N/A -- no UI changes.)
• Public docs/changelogs are updated where needed; changelogs are only edited for release-prep PRs.

Notes

• No behavior change, as the issue requires: every converted function's runtime logic and exported signature is unchanged from the original hand-written .js.
• This supersedes a first attempt (PR chore(mcp): add tsc build pipeline + convert small lib utilities to TypeScript (Phase 1 of #7291) #7404) that was auto-closed: tsc's printer left a trailing space at the end of format-table.js's compiled renderRow line because a comment sat between => and its expression body in the .ts source -- caught by CI's git diff --check gate (bare local git diff --check doesn't catch this since it only diffs uncommitted changes, not the full PR diff against origin/main; another contributor hit the identical tsc-printer quirk elsewhere in this repo, e.g. de94afbb8). Fixed by hoisting the comment above the declaration.
• Three existing test files (format-table.test.ts, redact-local-path.test.ts, mcp-local-telemetry.test.ts) had a @ts-expect-error suppression for dynamically importing what was previously an untyped .js module; these are now stale (TypeScript resolves the import to the new .ts source directly) and were removed.