chore(config): wire pql hooks + Makefile decision targets (pql migration phase 4)

Folds pql's planning logic into the version-controlled .config/hooks/* (pql's own
.pql/hooks installer is dead under core.hooksPath=.config/hooks):

  - pre-commit: + `pql decisions validate` (decision-ID/format gate, supersedes the
    never-built check-decision-ids TODO) and `pql plan export --stage` (flush ticket
    mutations to the git-tracked changelog and stage them into the commit). Both
    guarded by `command -v pql`; export is a clean no-op when nothing changed.
  - post-merge: `pql plan import` + `pql decisions sync` (replay incoming changelog,
    re-sync markdown decisions).
  - post-checkout (branch only): `pql plan rebuild` + `decisions sync`.
  - post-rewrite (rebase/amend): `pql plan rebuild`.
  - install-hooks chmods the three new hooks.

Makefile decision targets repointed to pql: decisions-sync -> `pql decisions sync`,
decisions-active -> `pql decisions list --type confirmed`, new decisions-validate ->
`pql decisions validate`. Dropped the SQLite-query conveniences (coverage/orphan/
orphan-tickets); per-decision coverage is `pql decisions show <id> --with-tickets`.

db-backup/db-install and SR_DB_PATH are intentionally kept until Phase 6 so the
legacy SQLite store stays intact as the migration rollback path.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Makefile

@@ -1,7 +1,7 @@
 GODOT := $(shell command -v godot4 2>/dev/null || command -v godot 2>/dev/null)
 
 .PHONY: help setup build check-protocol client server game stop test lint lint-python setup-venv ci ci-client ci-server clean \
-       decisions-sync decisions-coverage decisions-active decisions-orphan decisions-orphan-tickets \
+       decisions-sync decisions-active decisions-validate \
        db-backup db-install validate-content check-fact-ids setup-hooks install-hooks \
        audit deny atlas-verify economy-db regen-db check-systems-db \
        pre-pr pre-pr-lint pre-pr-build pre-pr-test pre-pr-validate pre-pr-fixtures \
@@ -45,11 +45,9 @@ help:
 	@echo "  make db-backup          Backup shared database to git (main only)"
 	@echo "  make db-install         Restore shared database from backup"
 	@echo ""
-	@echo "  make decisions-sync     Sync decisions/*.md into SQLite"
-	@echo "  make decisions-coverage Each decision with its implementing ticket(s)"
-	@echo "  make decisions-active   List active decisions"
-	@echo "  make decisions-orphan           Decisions without implementing tickets"
-	@echo "  make decisions-orphan-tickets   Tickets with invalid or missing decision_ref"
+	@echo "  make decisions-sync     Sync governance/*.md decision records into pql.db"
+	@echo "  make decisions-active   List active confirmed decisions (pql)"
+	@echo "  make decisions-validate Validate decision records — malformed-record gate (pql)"
 	@echo "  make audit              Run cargo audit (security advisory check)"
 	@echo "  make deny               Run cargo deny check (license/ban policy)"
 	@echo "  make validate-content   Validate content YAML against schemas"
@@ -114,8 +112,9 @@ setup-hooks:
 	@echo "Git hooks path set to .config/hooks"
 
 install-hooks: setup-hooks
-	@chmod +x .config/hooks/pre-push .config/hooks/pre-commit
-	@echo "Hooks installed — pre-push and pre-commit are active."
+	@chmod +x .config/hooks/pre-push .config/hooks/pre-commit \
+	          .config/hooks/post-merge .config/hooks/post-checkout .config/hooks/post-rewrite
+	@echo "Hooks installed — pre-commit, pre-push, post-merge, post-checkout, post-rewrite are active."
 
 setup-venv:
 	@python3 -m venv .venv
@@ -374,22 +373,19 @@ econ-sim-run:  ## Run a quick economics simulation (100 ticks, output to /tmp/ec
 econ-sim-stability:  ## Run D-179 stability checks (Tests 1 and 2)
 	@tooling/econ-sim/target/release/econ-sim --stability-check
 
-# --- Decisions ---
+# --- Decisions (pql) ---
+# Decision records are markdown-sourced under governance/{decisions,questions,rejected}/
+# and indexed into .pql/pql.db by `pql decisions sync`. Per-decision ticket coverage:
+# `pql decisions show <id> --with-tickets`. Cross-references: `pql decisions refs <id>`.
 
 decisions-sync:
-	@tooling/db/decisions-sync
-
-decisions-coverage:
-	@tooling/db/sqlite-query "SELECT d.id, d.domain, d.title, COALESCE(GROUP_CONCAT(t.id, ', '), '') as implementing_tickets FROM decisions d LEFT JOIN tickets t ON d.id = t.decision_ref WHERE d.status='active' AND d.type='confirmed' GROUP BY d.id ORDER BY d.domain, d.id"
+	@pql decisions sync
 
 decisions-active:
-	@tooling/db/sqlite-query "SELECT id, domain, title FROM decisions WHERE status='active' AND type='confirmed' ORDER BY domain, id"
+	@pql decisions list --type confirmed
 
-decisions-orphan:
-	@tooling/db/sqlite-query "SELECT id, title FROM decisions WHERE type='confirmed' AND status='active' AND id NOT IN (SELECT DISTINCT decision_ref FROM tickets WHERE decision_ref IS NOT NULL)"
-
-decisions-orphan-tickets:
-	@tooling/db/decision orphan-tickets
+decisions-validate:
+	@pql decisions validate
 
 # --- Content Validation ---