refactor(db): thread context.Context through all Store methods

Enables request-scoped cancellation, timeouts, and graceful shutdown
for all database operations across API handlers, CLI commands, and TUI.

cmd/absorb.go

@@ -19,19 +19,19 @@ func init() {
 	rootCmd.AddCommand(absorbCmd)
 }
 
-func runAbsorb(_ *cobra.Command, args []string) error {
+func runAbsorb(cmd *cobra.Command, args []string) error {
 	store, err := openStore()
 	if err != nil {
 		return err
 	}
 	defer store.Close()
 
-	targetID, err := store.Resolve(args[0])
+	targetID, err := store.Resolve(cmd.Context(), args[0])
 	if err != nil {
 		return fmt.Errorf("not_found — no entity with id %s", args[0])
 	}
 
-	sourceID, err := store.Resolve(args[1])
+	sourceID, err := store.Resolve(cmd.Context(), args[1])
 	if err != nil {
 		return fmt.Errorf("not_found — no entity with id %s", args[1])
 	}
@@ -40,7 +40,7 @@ func runAbsorb(_ *cobra.Command, args []string) error {
 		return fmt.Errorf("target and source must be different entities")
 	}
 
-	if err := store.Absorb(targetID, sourceID); err != nil {
+	if err := store.Absorb(cmd.Context(), targetID, sourceID); err != nil {
 		if err == db.ErrTargetCrystallized {
 			return fmt.Errorf("invalid_absorb — target %s is crystallized, demote first",
 				display.FormatID(targetID))