fix: stabilize CLI processing errors

[rogerchappel]

Summary

• add CLI regressions for malformed TypeScript analysis and failed baseline persistence in text and JSON modes
• handle analysis, report generation, and baseline persistence through one error boundary
• delay coverage output until baseline persistence succeeds and document the stable failure-output contract

Verification

• Tests or checks run: npm ci --ignore-scripts; npx vitest run src/cli.test.ts; npm run check; npm run lint; npm run release:check; git diff --check origin/main...HEAD
• Manual review completed: reviewed all three commits, the final diff, and text/JSON failure streams

Risk Level

• Low
• Medium
• High

Notes: The change only affects CLI failure handling. Successful report and baseline output remain unchanged.

Rollback Plan

• Revert the three commits in reverse order.

Human Decision Needed

• None
• Maintainer review
• Product/design decision
• Security/privacy review
• Other:

Commit-by-commit summary

• bda8eea test: cover CLI processing failures
• 6ffa29c fix: unify CLI processing errors
• 4a5df02 docs: define CLI failure output

[rogerchappel]

Automated merge note

• Triage class: auto-merge
• Summary: Unifies CLI handling for analysis and baseline-save failures, adds text/JSON regression coverage, and documents the failure-output contract (3 files, +71/-21).
• Checks run: GitHub Actions test on Node 20.19.0, 22, and 24 completed SUCCESS; final diff reread; branch protection verified (one approving review, no required status checks); all commit author/committer identities verified as Roger Chappel miscanalysis@gmail.com.
• Rebased/CI-repaired: No; neither was required.
• Verified head SHA: 4a5df0275f0ad261a52a399e4876eb0fa79ba8f7.