chore(tooling): retire atlas geometry generator + LLM naming cluster (D-223 #951)

The procedural server cascade (Phase 4) and the frozen names-only pool
supersede the Python atlas geometry generator and the LLM namer. Retire:

- generate_atlas.py (geometry production — cities/roads/rivers placement)
- gemma_naming.py, naming_core.py + tests (test_batch_naming,
  test_register_selection, qa_naming) and run-atlas-naming.sh (the LLM
  place-namer; its output is now the frozen pool)
- apply_name_fixes.py (name-field patches), fix_fewshot_bleed.py /
  prune_atlas_features.py (geometry tools)
- import_city_names.py (redundant with import_economics name-pool path)

Pipeline updates: drop the generate_atlas step + atlas-generate /
test-atlas-determinism targets from the Makefile; remove generate_atlas
from the stamp registry (import_economics is the sole regen-db generator);
drop run-atlas-determinism from tests/run-all; refresh stale references in
schema_version, backfill_cultural_corridor, earth_blocklist (kept as
reference data), populate_terrain_reference, and heightmap.rs.

The Gemma prompting methodology is preserved in
docs/gemma-naming-methodology.md (separate commit).

Co-Authored-By: Claude Opus 4.7 (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 lint-python setup-venv ci ci-client ci-server clean \
        decisions-sync decisions-coverage decisions-active decisions-orphan decisions-orphan-tickets \
        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 \
+       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 \
        pre-pr-server pre-pr-client pre-pr-content \
        fixtures-client fixtures-gauntlet golden-diff golden-update \
@@ -58,11 +58,9 @@ help:
 	@echo "  make star-map-data     Regenerate client/data/star_map_data.json from systems.db + wiki"
 	@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 test-atlas-determinism  Determinism smoke test for generate_atlas.py (#847)"
 	@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"
@@ -232,9 +230,6 @@ test-ipc-integration:
 test-ipc-benchmark:
 	tests/run-ipc-benchmark
 
-test-atlas-determinism:  ## Determinism smoke test for generate_atlas.py (#847)
-	tests/run-atlas-determinism
-
 # --- Clean ---
 
 clean-imports:
@@ -345,20 +340,6 @@ economy-db:  ## Import economics data (commodities, chains, gate links) into sys
 	@tooling/generate-brands
 	@python3 tooling/economy-db/import_economics.py
 
-atlas-generate:  ## Generate atlas markers (cities, roads, rail) for all inhabited bodies (#832)
-	@# Loud guard: generate_atlas.py reads bodies with a non-NULL terrain_reference.
-	@# If populate_terrain_reference.py has not run on a fresh DB, the generator
-	@# silently processes zero bodies and exits 0 — fail fast instead.
-	@count=$$(python3 -c "import sqlite3; c = sqlite3.connect('server/data/systems.db'); print(c.execute('SELECT COUNT(*) FROM bodies WHERE terrain_reference IS NOT NULL').fetchone()[0])"); \
-	if [ "$$count" = "0" ]; then \
-	    echo "ERROR: no bodies have terrain_reference populated yet."; \
-	    echo "Run: python3 tooling/planet-gen/populate_terrain_reference.py"; \
-	    echo "(This is a prerequisite for atlas-generate — see D-191 §9 pipeline order.)"; \
-	    exit 1; \
-	fi; \
-	echo "  [guard] $$count bodies with terrain_reference — proceeding."
-	@python3 tooling/planet-gen/generate_atlas.py --seed 42
-
 regen-db:  ## Regenerate systems.db from all sources and stamp meta table (#855, #856)
 	@# Run as a single shell so `set -e` covers all steps.  Without this
 	@# each recipe line was a fresh shell and a failure in step 1 did not
@@ -366,13 +347,14 @@ regen-db:  ## Regenerate systems.db from all sources and stamp meta table (#855,
 	@# (PR #136 review T4).  import_economics' exit code 2 is a valid
 	@# coverage-gate-warning state (DB and stamp committed), not an error,
 	@# so it's explicitly tolerated.  Any other non-zero exit halts the
-	@# pipeline immediately.
+	@# pipeline immediately.  The atlas city/road/river geometry generator
+	@# was retired in #951 (D-223); import_economics now owns the atlas
+	@# index — it loads the names-only pool into atlas_city_names and empties
+	@# the geometry tables (the server cascade fills them, Phase 4).
 	@set -e; \
 	  echo "  [regen-db] Importing economics data (runs generate_brands internally)..."; \
 	  ec=0; python3 tooling/economy-db/import_economics.py || ec=$$?; \
 	  if [ $$ec -ne 0 ] && [ $$ec -ne 2 ]; then exit $$ec; fi; \
-	  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"