docs: add a green-baseline-before-work gate to verification and start-work

A red test suite at the start of work poisons every later "did I break this?" check: you can't tell your own regressions from pre-existing noise, and the end-of-work green bar stops being readable. verification.md now asks for a clean suite run before work begins, not only before commit. start-work runs it as Pre-work step 0.3 against the reconciled base.

I added two carve-outs the original proposal lacked: a project with no suite has nothing to baseline, and a suite that can't run is the existing "When You Cannot Verify" case rather than a blocker. The step lands after the reconcile, so the baseline reflects the base the work is cut from. The Phase 4 TDD red is called out as expected, distinct from a baseline failure.

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