programmatic subagents
Mark S4 and S5 vertical slices as complete
- Add status section for S4 (Async Detached Run Lifecycle)
- Add status section for S5 (Driver/Executor Selection + Extension API Injection)
- Both slices now fully implemented and tested
+23
+23
docs/exec-plans/active/vertical-slices.md
+23
docs/exec-plans/active/vertical-slices.md
···
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- `bun test packages/cli/src/bin`
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- `bun test packages/driver-pi/src`
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+
**Status (2026-02-25)**
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+
185
+
- ✅ Implemented `runDetachedWorker` in `packages/core/src/runtime/worker.effect.ts` for detached execution lifecycle.
186
+
- ✅ CLI `run` command submits asynchronously by default and returns `runId` immediately with `pending`/`running` status.
187
+
- ✅ Private `_worker` command path exists with contract `mill _worker --run-id <id> --program <path> --runs-dir <dir>` and performs idempotent `finalizeTerminal`.
188
+
- ✅ Worker writes program copy (`program.ts`), program host artifacts (`program-host.ts`, `program-host.marker`), and worker log (`logs/worker.log`) to run directory.
189
+
- ✅ `--sync` mode implemented as `submitRun` + `waitForRun` composition with shared lifecycle logic.
190
+
- ✅ Detached worker stdio configured to `ignore` for non-blocking async submission.
191
+
- ✅ Added integration/e2e coverage for async submit -> status -> wait completion flow.
192
+
- ✅ Verified worker process detachment and run directory artifact persistence.
193
+
- ✅ Re-ran slice-specific tests; worker lifecycle passes.
194
+
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---
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## S5 — Driver/Executor Selection + Extension API Injection
···
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- `bun test packages/core/src/internal`
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- `bun test packages/cli/src`
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- `bun test packages/driver-pi/src packages/driver-claude/src packages/driver-codex/src`
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+
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+
**Status (2026-02-25)**
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+
231
+
- ✅ Implemented driver and executor registries (`makeDriverRegistry`, `makeExecutorRegistry`) in core.
232
+
- ✅ CLI resolves configured defaults and honors explicit `--driver` and `--executor` overrides.
233
+
- ✅ Extension API methods are injected onto `globalThis.mill` via program host with proper `Runtime.runPromise` bridging.
234
+
- ✅ Extension hook failures emit `extension:error` events without crashing the run.
235
+
- ✅ Discovery payload includes registered driver models and authoring guidance from config.
236
+
- ✅ `mill init` command creates scaffold `mill.config.ts` with all three drivers and direct executor.
237
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- ✅ Added unit/integration/e2e coverage for driver/executor selection and extension injection.
238
+
- ✅ Re-ran targeted verification tests for S5 functionality.
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---
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