docs(P00): create phase plans — v1.22 (7 phases, 4 waves)

Vertical-slice plan with wave ordering:
- Wave 1 (P1+P2, parallel): theme CSS + render scripts. Zero file
  overlap. P1 establishes padding/overflow/image budget; P2 fixes
  render pipeline.
- Wave 2 (P3+P4, parallel): mermaid re-layout + deck content. P3
  depends on P2 (2x scale); P4 depends on P1 (padding budget).
- Wave 3 (P5): re-render HTML+PPTX + add layout/aspect-ratio/theme-
  structural tests. Depends on all above.
- Wave 4 (P6): final review + audit + milestone ship.

Tags on v1.21.x line: v1.21.0 (P0) -> v1.21.1..v1.21.5 (P1-P5) ->
v1.21.6 (P6 final = milestone release).

---ci---
project: acdl
phase: 0
milestone: v1.22
status: plan
---/ci---

.ciagent/CHECKPOINT.json

@@ -1,12 +1,12 @@
 {
   "phase": 0,
-  "stage": "clarify",
+  "stage": "research",
   "milestone": "v1.22",
   "phase_role": "pre_execution",
   "attempts": 0,
-  "updated_at": "2026-08-11T14:32:00Z",
+  "updated_at": "2026-08-11T14:35:00Z",
   "milestone_complete": false,
   "tag": null,
   "requirements": ["REQ-254","REQ-255","REQ-256","REQ-257","REQ-258","REQ-259","REQ-260","REQ-261","REQ-262"],
-  "notes": "v1.22 CLARIFY complete. 5 ambiguities auto-resolved at full autonomy (comprehensive scope, full pipeline, re-layout to LR, delete render_deck.sh, split slides 3+8). No human escalation."
+  "notes": "v1.22 RESEARCH complete. 8 findings persisted to RESEARCH.md. Persona roster updated (2 active: lead-developer + backend-engineer; 2 deactivated: frontend + data). D-148, D-149 logged."
 }