docs(phase-12): evolve PROJECT.md after phase completion

.planning/PROJECT.md

@@ -150,15 +150,23 @@ future milestone that will consume this data once it exists.
   all carrying cost data, 0 unreferenced products, stable across re-run.
   Validated in Phase 11: Company, Catalog & Subscription Sync
   (PAX8-03, PAX8-04, PAX8-05, PAX8-08)
+- ✓ Historical PAX8 invoice/order-item costs synced per company with billing
+  periods (`pax8_order_items`: 29,311 rows across ~56k live history),
+  fuzzy-name Autotask company matching via pg_trgm (0.90 auto-link threshold,
+  80 confident auto-matches), no-match/ambiguous companies flagged in
+  `pax8_company_match_review` instead of silently guessed (38 unresolved:
+  16 no-match, 22 ambiguous), idempotent across re-syncs (resolved matches
+  never overwritten). Validated in Phase 12: Orders/Invoices & Company
+  Matching (PAX8-06, PAX8-10, PAX8-11)
 
 ### Active
 
 <!-- Hypotheses for this milestone — see .planning/seeds/SEED-002-pax8-integration.md -->
 
-- Historical orders/invoices sync, fuzzy-name Autotask company matching, new
-  `/pax8` page, daily sync cadence — v2.0 PAX8 Integration milestone (see
-  above); client/auth/schema foundation (Phase 10) and current-state sync
-  (Phase 11) now validated above
+- New `/pax8` page, daily sync cadence — v2.0 PAX8 Integration milestone (see
+  above); client/auth/schema foundation (Phase 10), current-state sync
+  (Phase 11), and historical orders/invoices + company matching (Phase 12)
+  now validated above
 
 ### Out of Scope
 
@@ -246,4 +254,4 @@ This document evolves at phase transitions and milestone boundaries.
 4. Update Context with current state
 
 ---
-*Last updated: 2026-07-11 — Phase 11: Company, Catalog & Subscription Sync complete*
+*Last updated: 2026-07-11 — Phase 12: Orders/Invoices & Company Matching complete*