feat: refine builder skill chip flows

database/schema.sql

@@ -1422,6 +1422,17 @@ CREATE TABLE IF NOT EXISTS specialization_ability_attacks (
 	CHECK(charge_policy<>'none' OR charge_count=1)
 );
 CREATE INDEX IF NOT EXISTS specialization_abilities_specialization_idx ON specialization_abilities(specialization_id,name);
+CREATE TABLE IF NOT EXISTS specialization_ability_skill_chip_links (
+	ability_id TEXT NOT NULL REFERENCES specialization_abilities(id) ON DELETE CASCADE,
+	compatible_ability_id TEXT NOT NULL REFERENCES specialization_abilities(id) ON DELETE CASCADE,
+	PRIMARY KEY(ability_id,compatible_ability_id),
+	CHECK(ability_id<compatible_ability_id)
+);
+CREATE INDEX IF NOT EXISTS specialization_ability_skill_chip_links_compatible_idx
+	ON specialization_ability_skill_chip_links(compatible_ability_id,ability_id);
+-- db-migrate.mjs installs insert/update triggers for active same-specialization
+-- endpoints and one-pair-per-ability enforcement. Trigger bodies cannot live in
+-- this semicolon-delimited schema file.
 CREATE TABLE IF NOT EXISTS specialization_ability_effects (
 	id TEXT PRIMARY KEY,
 	ability_id TEXT NOT NULL REFERENCES specialization_abilities(id) ON DELETE CASCADE,