fix: orchestrator quality gate timing — rebase ordering, Copilot review request, in-flight check

[microsasa]

Fixes

#211 — Race condition: quality gate dispatched before rebase

Check mergeStateStatus before step 4. If PR is BEHIND or DIRTY, skip quality gate — the rebase step handles it, next cycle dispatches on rebased commit.

#203 — No fallback if Copilot review never runs

Proactively request Copilot review via gh pr edit --add-reviewer @copilot when no review exists on current commit. Safe to call repeatedly — if review is in progress, request is ignored.

#213 — Duplicate quality gate dispatches

Check if quality gate is already in_progress/queued/waiting before dispatching. Same pattern as implementer in-flight check (#164/#190).

Commits

1. fix: skip quality gate dispatch if PR needs rebase — mergeStateStatus check
2. fix: request Copilot review if missing + check quality gate in-flight — proactive review request + duplicate dispatch guard
3. docs: update changelog and pitfalls — pitfalls [aw][code health] Test hygiene bundle: unused _NOW constant and CI coverage scope mismatch #32-34

Fixes #211, #203, #213