feat(providers): add pure claude adapter with record-stream golden tests (5b-1)

claude.parse mirrors indexJsonl line-for-line but yields IndexRecords (no db).
Adds MessageTurnDurationRecord op. Purely additive — buildIndex still uses the
old path. 111/111 green.

scripts/providers/types.ts

@@ -60,6 +60,7 @@ export type IndexRecord =
   | SubagentRecord
   | WorkflowRecord
   | WorkflowAgentRecord
+  | MessageTurnDurationRecord
   | DeleteSessionRecord;
 
 export interface MessageRecord {
@@ -163,6 +164,15 @@ export interface WorkflowAgentRecord {
   tool_calls?: number | null;
 }
 
+// Update op (not a table): sets messages.turn_duration_ms for a message that was
+// (or will be) inserted by a separate line, possibly on a different run. Persist
+// applies it as a targeted UPDATE, so it never clobbers other message columns.
+export interface MessageTurnDurationRecord {
+  kind: 'message-turn-duration';
+  uuid: string;
+  turn_duration_ms: number;
+}
+
 // Retraction op (not a table). The adapter emits this when a previously-indexed
 // session must be removed — e.g. a Codex guardian/auto-review thread. Persist
 // executes the cascade delete across all tables for that session.