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

[JSONbored]

Problem

#7291 proposed migrating packages/loopover-mcp to TypeScript, phased by file size after a real
line-count check showed the six files are wildly uneven (27 to 6,594 lines). This is Phase 1:
prove the build pipeline against the four smallest, lowest-risk files before touching anything
larger.

Proposal

• Add packages/loopover-mcp/tsconfig.json and a real tsc-based build/typecheck script,
  replacing the current node --check-only build.
• Convert these four files (no existing .d.ts to remove -- this package has none):
  • lib/cli-error.js (27 lines)
  • lib/format-table.js (58 lines)
  • lib/redact-local-path.js (58 lines)
  • lib/telemetry.js (68 lines)

Deliverables

• packages/loopover-mcp/tsconfig.json added
• build/typecheck scripts updated to a real tsc compile
• All 4 files converted from .js to .ts
• CLI still runs identically post-build

Test Coverage Requirements

No behavior change from this migration alone. Existing tests must continue to pass unmodified.

Expected Outcome

The build pipeline is proven and these four small utilities are real TypeScript, clearing the way
for #7291's Phase 2 (local-branch.js) and Phase 3 (bin/loopover-mcp.js).

Links & Resources

• chore(mcp): migrate packages/loopover-mcp from plain .js to real TypeScript #7291 -- the parent migration proposal and phasing plan
• chore(miner): migrate packages/loopover-miner from plain .js + hand-maintained .d.ts to real TypeScript #7290's own Phase 1 (chore(miner): add a real tsc build pipeline for loopover-miner (#7290) #7299) -- the precedent this mirrors for packages/loopover-miner

[linear-code]

JSO-5114