feat(council-archive): register council tools and add write_output_to_file to task tool

- Register council_finalize and council_read in tool registry
- Add write_output_to_file param to delegate-task, propagate to LaunchInput
- Create council-archive barrel exports

src/tools/council-archive/index.ts

@@ -0,0 +1,5 @@
+export { createCouncilFinalize } from "./create-council-finalize"
+export { createCouncilRead } from "./create-council-read"
+export { extractCouncilResponse, OPENING_TAG, CLOSING_TAG } from "./council-response-extractor"
+export type { CouncilResponseExtraction } from "./council-response-extractor"
+export type { CouncilFinalizeArgs, CouncilMemberResult, CouncilFinalizeResult } from "./types"