phase29ap(p0): reduce legacy extractors (pattern1/3)

docs/development/current/main/phases/phase-29ap/README.md

@@ -0,0 +1,32 @@
+---
+Status: Active
+Scope: Legacy extractor reduction (planner+composer SSOT)
+Related:
+- docs/development/current/main/design/coreplan-migration-roadmap-ssot.md
+- docs/development/current/main/design/coreplan-migration-done-criteria-ssot.md
+- docs/development/current/main/design/coreloop-composer-v0-v1-boundary-ssot.md
+- docs/development/current/main/phases/phase-29ae/README.md
+---
+
+# Phase 29ap: Legacy extractor reduction (Step-E)
+
+Goal: Reduce legacy extractor fallbacks while keeping planner+composer as the SSOT path.
+
+Gate (SSOT):
+- `./tools/smokes/v2/profiles/integration/joinir/phase29ae_regression_pack_vm.sh`
+
+## P0: Reduce legacy extractors (Pattern1/3) ✅
+
+- Scope:
+  - Remove Pattern1/3 extractor fallbacks in `single_planner`.
+  - Remove Pattern3 JoinIR router entry so plan line is the only path.
+  - Pattern1 JoinIR entry is retained for now (stdlib loops still rely on it).
+- Guardrails:
+  - Outcome remains `Ok(None)` for non-matching cases.
+  - No new logs or error strings.
+
+## Next (planned)
+
+- P1: Pattern6/7 JoinIR wrapper → composer entry only
+- P2: Router pattern-name branching reduction (planner outcome + composer SSOT)
+- P3: Facts/Feature expansion if needed