chore(tooling): consolidate atlas tooling + harden pre-push hook

- Rewrite atlas-verify as proper Python script (was inline Python in
  bash with path injection risk). Adds star_type/spectral_class
  consistency check. Supports multiple files via glob.
- Add atlas-names and atlas-systems-done query helpers (clean versions
  of what the copy branch created — supersedes atlas-helpers.sh)
- Wire atlas-verify into Makefile (make atlas-verify, pre-pr-content)
- Update atlas skill references to point to the script
- Merge diff-based skip into pre-push hook: only lint client/ or
  server/ when those dirs actually changed in the push. Combined with
  existing directory-existence guards for cold worktrees.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Makefile

@@ -3,7 +3,7 @@ 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 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 \
+       audit atlas-verify \
        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 \
@@ -49,6 +49,7 @@ help:
 	@echo "  make audit              Run cargo audit (security advisory check)"
 	@echo "  make validate-content   Validate content YAML against schemas"
 	@echo "  make check-fact-ids    Check fact_id references against knowledge catalogs"
+	@echo "  make atlas-verify      Verify atlas proposal JSONs (all in docs/atlas/proposals/)"
 	@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"
@@ -291,7 +292,7 @@ pre-pr-server: lint-server build-server test-server pre-pr-fixtures audit
 pre-pr-client: lint-client build-client test-client
 	@echo "=== Client pre-PR: PASSED ==="
 
-pre-pr-content: validate-content check-fact-ids checklist-validate
+pre-pr-content: validate-content check-fact-ids checklist-validate atlas-verify
 	@echo "=== Content pre-PR: PASSED ==="
 
 # --- CI (run locally) ---
@@ -332,6 +333,9 @@ validate-content:
 check-fact-ids:
 	@tooling/check-fact-ids
 
+atlas-verify:
+	@tooling/atlas-verify docs/atlas/proposals/*.json
+
 audit:
 	cd server && cargo audit