feat(ci): add pre-commit FactId validation hook (#393)

Grep-based pre-commit check validating fact_id references in content
YAML against canonical knowledge catalogs. Runs in advisory mode when
catalogs are stubs (exit 0), switches to enforcing mode once populated
(exit 1 on unknown fact_ids with file:line output).

- tooling/check-fact-ids: core validation script (<2s runtime)
- .config/hooks/pre-commit: hook dispatcher for modular checks
- Makefile: check-fact-ids + setup-hooks targets, wired into setup
- docs/DEVOPS.md: content validation and pre-commit hooks sections

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Makefile

@@ -2,7 +2,7 @@ GODOT := $(shell command -v godot4 2>/dev/null || command -v godot 2>/dev/null)
 
 .PHONY: help setup build client server game stop test lint ci ci-client ci-server clean \
        decisions-sync decisions-coverage decisions-active decisions-orphan \
-       db-backup db-install validate-content content-ron
+       db-backup db-install validate-content content-ron check-fact-ids setup-hooks
 
 # --- Configuration ---
 
@@ -32,14 +32,17 @@ help:
 	@echo "  make decisions-coverage Decision-to-ticket coverage by domain"
 	@echo "  make decisions-active   List active decisions"
 	@echo "  make decisions-orphan   Decisions without implementing tickets"
-	@echo "  make validate-content  Validate content YAML against schemas"
+	@echo "  make validate-content   Validate content YAML against schemas"
+	@echo "  make check-fact-ids    Check fact_id references against knowledge catalogs"
 	@echo "  make content-ron       Convert content YAML to RON (build-time)"
 	@echo ""
+	@echo "  make setup-hooks       Install pre-commit hooks (included in setup)"
+	@echo ""
 	@echo "  GODOT_VERSION=4.6 make setup   Override Godot version"
 
 # --- Setup ---
 
-setup: setup-rust setup-godot setup-tooling decisions-sync
+setup: setup-rust setup-godot setup-tooling setup-hooks decisions-sync
 	@echo "Dev environment ready."
 
 setup-rust:
@@ -54,6 +57,10 @@ setup-tooling:
 	@command -v curl >/dev/null 2>&1 || { echo "Install curl (required for Godot download)"; exit 1; }
 	@command -v unzip >/dev/null 2>&1 || { echo "Install unzip (required for Godot download)"; exit 1; }
 
+setup-hooks:
+	@git config core.hooksPath .config/hooks
+	@echo "Git hooks path set to .config/hooks"
+
 # --- Build ---
 
 build: build-server build-client
@@ -149,6 +156,9 @@ decisions-orphan:
 validate-content:
 	@tooling/validate-content
 
+check-fact-ids:
+	@tooling/check-fact-ids
+
 content-ron:
 	cd tooling/content-converter && cargo build --release
 	tooling/content-converter/target/release/content-converter --input content --output content-ron --verbose