feat(db): corp-HQ settlement model + per-settlement population/class bake (T-1074/T-1075, D-242)

Remove the reserved=1 corp-HQ city-pool cross-reference (duplicate co-named cities); corp_specialization keyed on the D-237 vocabulary extended 27->30; authored corp_hq_placement.toml {CityTenant,Standalone} map; headquarters_body backfill via lifted most-populated-body heuristic + body-type tiebreak; standalone HQs emitted as ordinary settlement rows; Zipf rank-size population spread from bodies.population at import; settlement_class defaults PopulationBudget + settlement_name_locked.toml hero pins; retire orphaned populate-corporations.sh; regen systems.db.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tooling/generator_sources.py

@@ -74,6 +74,16 @@ SPECIALIZATION_VOCAB_TOML: Path = (
 SYSTEM_SPECIALIZATION_TOML: Path = (
     REPO_ROOT / "wiki" / "economics" / "system_specialization.toml"
 )
+# D-242 corp-HQ settlement model (T-1074): specialization -> {CityTenant,
+# Standalone} placement map, keyed on the reused D-237 vocabulary above.
+CORP_HQ_PLACEMENT_TOML: Path = (
+    REPO_ROOT / "wiki" / "economics" / "corp_hq_placement.toml"
+)
+# D-242 population/settlement_class bake (T-1075): the small authored
+# NameLocked hero-city override list.
+SETTLEMENT_NAME_LOCKED_TOML: Path = (
+    REPO_ROOT / "wiki" / "economics" / "settlement_name_locked.toml"
+)
 # D-232 architecture-flavor trait-template catalog + sparse hero bias (#993).
 ARCHITECTURE_TRAIT_CATALOG_TOML: Path = (
     REPO_ROOT / "wiki" / "economics" / "architecture_trait_catalog.toml"
@@ -132,6 +142,8 @@ IMPORT_ECONOMICS_SOURCES: tuple[Path, ...] = (
     REPO_ROOT / "tooling" / "schema_version.py",
     SPECIALIZATION_VOCAB_TOML,
     SYSTEM_SPECIALIZATION_TOML,
+    CORP_HQ_PLACEMENT_TOML,
+    SETTLEMENT_NAME_LOCKED_TOML,
     ARCHITECTURE_TRAIT_CATALOG_TOML,
     ARCHITECTURE_TRAIT_BIAS_TOML,
     OBJECT_TAG_VOCABULARY_TOML,