feat(write-fr): Step 4 Verification Gate — five-dimension AC scoring after assembly

[felipecabargas]

Summary

• Adds Phase 4 — Verification Gate to write-feature-request, running automatically after Phase 3 (FR Assembly) and before the FR is returned to the user
• Every AC in every requirement table is evaluated against all five quality dimensions: Specificity, Testability, Outcome-Focus, Measurability, and Independence (new — previously only four dimensions were checked)
• ACs with warning-severity gaps are rewritten inline; ACs with blocker-severity gaps send the affected requirement back to Phase 2 only (other requirements are not disturbed); the FR is not returned until every AC passes
• A Verification Summary table is appended to every FR output — shows each requirement, AC count, and gate outcome (Passed / Revised / Reopened) — so the gate is visible without exposing raw scoring internals
• verify-acceptance-criteria is unchanged; it continues to work standalone for users who bring existing ACs
• Version bumped: 1.0.0 → 1.1.0

What changed

File	Change
skills/write-feature-request/SKILL.md	Phase 4 section added; Phase 3 now hands off instead of returning; Evaluation Framework gains Independence dimension and Phase 2 vs. Phase 4 column; Output Format includes Verification Summary template
skills/verify-acceptance-criteria/SKILL.md	Untouched

Test plan

• Run /gambit:write-feature-request end-to-end; confirm Phase 4 runs silently and Verification Summary appears at the bottom of the FR
• Craft a requirement whose AC fails on Independence (depends on another AC to be meaningful); confirm Phase 2 is reopened for that requirement only
• Craft a requirement whose AC has a warning (vague threshold); confirm AC is rewritten inline without a Phase 2 loop
• Run /gambit:verify-acceptance-criteria standalone with existing ACs; confirm it works exactly as before

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