chore(ci): generator-driven asset pipeline — meta stamp + hook + regen target

Adds systems.db regeneration discipline (#855) via a `meta` table (#856)
stamped by every generator, a pre-push hook that rejects stale DBs (#857),
and the top-level `make regen-db` / `make check-systems-db` targets that
drive the whole pipeline.

The stamp stores SHA-1 of generator source + schema, so the pre-push hook
can cheaply detect "you changed a generator but forgot to regen the DB"
before a binary merge conflict lands. Sprint 36 hit that class of conflict
on two branches touching systems.db simultaneously — this is the systemic
fix.

Regenerated systems.db is stamped; `make check-systems-db` passes.

Refs: #855 #856 #857

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

Makefile

@@ -2,8 +2,8 @@ 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 \
-       db-backup db-install validate-content check-fact-ids setup-hooks \
-       audit deny atlas-verify economy-db atlas-generate \
+       db-backup db-install validate-content check-fact-ids setup-hooks install-hooks \
+       audit deny atlas-verify economy-db atlas-generate regen-db check-systems-db \
        pre-pr pre-pr-lint pre-pr-build pre-pr-test pre-pr-validate pre-pr-fixtures \
        pre-pr-server pre-pr-client pre-pr-content \
        fixtures-client fixtures-gauntlet golden-diff golden-update \
@@ -46,7 +46,7 @@ help:
 	@echo "  make db-install         Restore shared database from backup"
 	@echo ""
 	@echo "  make decisions-sync     Sync decisions/*.md into SQLite"
-	@echo "  make decisions-coverage Decision-to-ticket coverage by domain"
+	@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 audit              Run cargo audit (security advisory check)"
@@ -58,6 +58,9 @@ help:
 	@echo "  make check-star-map    Assert star_map_data.json is up to date (part of pre-pr-client)"
 	@echo "  make economy-db        Import economics data into systems.db (TOML/JSON → SQLite)"
 	@echo "  make atlas-generate    Generate atlas city/road/rail markers for all inhabited bodies"
+	@echo "  make regen-db          Regenerate systems.db from all sources + stamp meta table (#855)"
+	@echo "  make check-systems-db  Verify systems.db meta stamp matches current generator sources"
+	@echo "  make install-hooks     Install pre-push + pre-commit git hooks (once per clone)"
 	@echo "  make fixtures-client    Generate GDScript->Rust cross-encoder fixtures (#475)"
 	@echo "  make golden-diff        Show diff if golden file output has changed"
 	@echo "  make golden-update      Regenerate golden file and stage for commit"
@@ -110,6 +113,10 @@ setup-hooks:
 	@git config core.hooksPath .config/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."
+
 setup-venv:
 	@python3 -m venv .venv
 	@.venv/bin/pip install -e ".[dev]" --quiet
@@ -347,6 +354,20 @@ atlas-generate:  ## Generate atlas markers (cities, roads, rail) for all inhabit
 	echo "  [guard] $$count bodies with terrain_reference — proceeding."
 	@python3 tooling/planet-gen/generate_atlas.py --seed 42
 
+regen-db:  ## Regenerate systems.db from all sources and stamp meta table (#855, #856)
+	@echo "  [regen-db] Generating minor brands..."
+	@tooling/generate-brands
+	@echo "  [regen-db] Importing economics data..."
+	@python3 tooling/economy-db/import_economics.py; ec=$$?; [ $$ec -eq 0 ] || [ $$ec -eq 2 ] || exit $$ec
+	@echo "  [regen-db] Running atlas generator..."
+	@python3 tooling/planet-gen/generate_atlas.py --seed 42
+	@echo ""
+	@echo "  regen-db complete — systems.db is up to date and stamped."
+	@echo "  Stage it with: git add server/data/systems.db"
+
+check-systems-db:  ## Verify systems.db meta stamp matches current generator sources (#857)
+	@python3 tooling/check-systems-db-stamp --verbose
+
 econ-sim:  ## Build the economics simulation binary (Layer 1+2: Leontief + tâtonnement trade)
 	@cargo build --manifest-path tooling/econ-sim/Cargo.toml --release
 	@echo "Built: tooling/econ-sim/target/release/econ-sim"
@@ -364,7 +385,7 @@ decisions-sync:
 	@tooling/db/decisions-sync
 
 decisions-coverage:
-	@tooling/db/sqlite-query "SELECT d.domain, COUNT(DISTINCT d.id) as decisions, COUNT(DISTINCT t.decision_ref) as with_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.domain"
+	@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"
 
 decisions-active:
 	@tooling/db/sqlite-query "SELECT id, domain, title FROM decisions WHERE status='active' AND type='confirmed' ORDER BY domain, id"