docs(milestone): complete v1.27 PO State Catalog & Ciagent Compression (release v1.26.3)

v1.27 COMPLETE. NFR milestone — PO State Catalog & Ciagent Compression.

Phases:
- P0 pre-execution (specify→clarify→research→plan→grill) → v1.26.0
- P1 author-archive (STATE.md + 8 files archived) → v1.26.1
- P2 fix-stale-wire (PROJECT/ROADMAP phase-status + ship-discipline wiring) → v1.26.2
- P3 final-review-ship (review + audit + milestone ship) → v1.26.3

Delivered:
- .ciagent/STATE.md — PO-facing capability catalog (32 CAP rows +
  11 invariants across 10 domains, backfilled through v1.26). The
  first file the PO reads before writing a new REQ-NNN spec.
- .ciagent/ compression: 7 platform-root files + 1 consumer file
  archived (lossless git mv). Active .md count: 15 (was 25).
- PROJECT.md + ROADMAP.md v1.26 phase-status corrected (P3/P4/P5
  → complete; v1.25.5 shipped; merged to main).
- STATE.md wired into the P-final ship discipline (PLAN.md, ROADMAP.md,
  NORTH_STAR.md). Every future milestone ship appends capability rows +
  bumps the 'Last milestone ship' header.

Review: 0 P0 issues. Audit: reconstruction PASS, file discipline CLEAN,
branch hygiene CLEAN, commit discipline CLEAN (13/13 ---ci--- blocks).
NFR purity gate holds (zero feat: commits).

---ci---
project: acdl
phase: 3
milestone: v1.27
status: complete
---ci---

.ciagent/CHECKPOINT.json

@@ -1,17 +1,19 @@
 {
-  "phase": 2,
+  "phase": 3,
   "stage": "complete",
   "milestone": "v1.27",
-  "phase_role": "execution",
+  "phase_role": "final",
   "attempts": 0,
-  "updated_at": "2026-08-19T05:15:00Z",
+  "updated_at": "2026-08-19T05:30:00Z",
   "project": "acdl",
   "projects": ["acdl", "nova-blockchain-exchange"],
   "active_milestone": "v1.27",
   "milestone_branch": "milestone/v1.27-po-state-catalog",
-  "phase_branch": "phase/02-fix-stale-wire",
+  "phase_branch": "phase/03-final-review-ship",
   "tag_line": "v1.26.x",
-  "current_phase": {"phase": 2, "tag": "v1.26.2", "status": "complete"},
-  "previous_phase": {"phase": 1, "tag": "v1.26.1", "status": "complete"},
-  "notes": "v1.27 P2 complete. PROJECT.md + ROADMAP.md phase-status fixed (P3/P4/P5 complete, v1.25.5 shipped). STATE.md wired into PLAN.md + NORTH_STAR.md + ROADMAP.md P5 ship-update lists. archive/README.md updated with 8 archived files. 0 active dangling references. Next: P3 final-review-ship."
+  "current_phase": {"phase": 3, "tag": "v1.26.3", "status": "complete"},
+  "previous_phase": {"phase": 2, "tag": "v1.26.2", "status": "complete"},
+  "milestone_complete": true,
+  "milestone_release": {"tag": "v1.26.3", "type": "nfr"},
+  "notes": "v1.27 COMPLETE. NFR milestone (PO State Catalog & Ciagent Compression). 3 phases. STATE.md authored (32 CAPs, 11 invariants, 10 domains). 8 files archived (7 platform + 1 consumer). PROJECT.md + ROADMAP.md v1.26 phase-status fixed. STATE.md wired into P-final ship discipline. Review: 0 P0. Audit: reconstruction PASS, file discipline CLEAN, branch hygiene CLEAN, commit discipline CLEAN (13/13 ---ci--- blocks). Next run starts a new milestone."
 }