feat(automation): add isolated job delivery mode

docs/plans/2026-02-16-announce-delivery-mode-checklist.md

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+# Announce Delivery Mode Checklist
+
+Date: 2026-02-16
+Status: completed
+
+## Scope
+
+- Add a first-class automation delivery mode for cron/webhook runs.
+- Support isolated per-run sessions while preserving outbound reply routing.
+
+## Completed
+
+- Added `automation.delivery_mode` config enum in `src/config/schema.ts`:
+  - `shared_session` (default)
+  - `isolated_job`
+- Implemented reply routing override in `src/channels/registry.ts` via `metadata.replyPeerId`.
+- Updated `CronScheduler` and `WebhookHandler` to:
+  - emit unique sender IDs per run when `delivery_mode=isolated_job`
+  - include `metadata.replyPeerId` to keep output routing stable
+  - include delivery metadata (`deliveryMode`, `runId`) for traceability
+- Wired delivery mode through channel registration in `src/daemon/channels.ts`.
+- Updated docs:
+  - `README.md` automation sections
+  - `config/default.yaml` commented template
+- Added tests:
+  - `src/channels/registry.test.ts`
+  - `src/automation/cron.test.ts`
+  - `src/automation/webhooks.test.ts`
+  - `src/config/schema.test.ts`
+
+## Verification
+
+- `pnpm test:run src/channels/registry.test.ts`
+- `pnpm test:run src/automation/cron.test.ts src/automation/webhooks.test.ts`
+- `pnpm test:run src/config/schema.test.ts`
+- `pnpm typecheck`