docs(start-work): add Phase 0 pre-work (reconcile + source check)

Phase 0 was a single eligibility gate. Two gaps: the skill cut new branches from whatever HEAD happened to be, and trusted the ticket's premise without checking the tree.

Two new sub-sections fix both before any state change. 0.2 fetches and fast-forwards the base branch, surfacing dirty or diverged state instead of auto-resolving. 0.3 reads the source, not git log, to confirm the problem the ticket describes still exists, with three dispositions for "the problem isn't there" findings: close, dig harder, or proceed with reduced confidence flagged at the Justify gate.

Two matching anti-patterns added: skipping the reconcile, and taking the ticket's word for it.

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