Fix lockfile generation, Key authoring hardening, and generic table injection

internal/topdata/FEAT_GENERATED_FAMILIES_CONTRACT.md

@@ -53,7 +53,6 @@ Compact family-expansion shape:
   },
   "apply_after_modules": true,
   "child_ref_field": "REQSKILL",
-  "allow_existing_only": true,
   "child_source": {
     "dataset": "skills",
     "predicate": "accessible"
@@ -116,6 +115,8 @@ Rules:
 - family-expansion files must declare `template`, `family_key`, and `child_source.dataset`
 - `child_source.column` is used when expansion is gated by a non-null source field
 - `child_source.predicate: "accessible"` currently means `HideFromLevelUp != 1`
+- skill focus families intentionally do not set `allow_existing_only`, so any new
+  accessible skill automatically receives matching focus rows
 - compact `overrides` are keyed by source dataset key:
   - `skills:*` for skill families
   - `baseitems:*` for weapon families