docs+skills: add main UI/UX visual-truth PRD and skill links

.agents/skills/beadboard-driver/references/session-lifecycle.md

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+# Session Lifecycle
+
+## 1) Start Session
+
+1. Run preflight.
+2. Resolve bb path and confirm `bd` availability.
+3. Generate unique session agent name.
+4. Register agent identity.
+
+## 2) Pick and Claim Work
+
+1. `bd ready`
+2. `bd show <id>`
+3. `bd update <id> --status in_progress --claim`
+
+## 3) Coordinate During Work
+
+1. Reserve sensitive scopes before edits.
+2. Send structured mail for blockers and handoffs.
+3. Read and acknowledge required messages.
+
+## 4) Verify and Close
+
+1. Run required gates (typecheck/test/lint).
+2. Build readiness report with checks + artifacts.
+3. Post notes to bead.
+4. Close bead with explicit reason.
+
+## 5) Session End Hygiene
+
+1. Release reservations.
+2. Ensure no unresolved blocker mail is pending for your bead.
+3. Hand off context if stopping before close.