# K-TV Parallel Execution Plan

## Strategy

3 parallel worktree tracks (zero file overlap), then a sequential tail after merging.

## Parallel Tracks

### Track A: Schedule Engine (`feat/schedule-engine`)
**Files:** `domain/src/services/schedule/`, `domain/src/value_objects/scheduling.rs`

1. **#3** — Wire Alternating, Weighted, Marathon into schedule engine dispatch
2. **#4** — Interstitial insertion in schedule engine
3. **#8** — Gap filler logic
4. **#6** — Mid-roll break logic (blocked by #4 and #5, but #5 is Track C — merge C first or stub chapters)

### Track B: Playout Service (`feat/playout`)
**Files:** `crates/playout/` (entirely new crate — zero overlap)

1. **#9** — Core HLS streaming (single channel, FFmpeg, SegmentStore port)
2. **#11** — Multi-channel + shared broadcast loop
3. **#10** — SCTE-35 markers + overlay metadata (blocked by #6, so merge Track A first)

### Track C: Library Sync (`feat/library-sync`)
**Files:** `adapters/*/src/` (sync logic only)

1. **#5** — Chapter extraction during library sync (ffprobe)
2. **#7** — MediaRole auto-detection during library sync

## Merge Order

```
             ┌─ Track A (schedule engine) ──────────┐
master ──────┤  Track B (playout) ──────────────────┤── merge A ── merge C ── merge B ── sequential tail
             └─ Track C (library sync) ─────────────┘
```

1. Merge **Track C** first (library sync — smallest, no downstream deps)
2. Merge **Track A** second (schedule engine — #6 needs chapters from Track C)
3. Merge **Track B** third (playout — #10 needs mid-roll from Track A)

Track B can merge whenever since it's a new crate, but #10 and #11 depend on other tracks, so practically it merges last.

## Sequential Tail (after all tracks merge)

On master, in order:

5. **#14** — OpenAPI: wire utoipa in presentation
6. **#15** — iCalendar export
7. **#16** — iCalendar import (blocked by #15)
8. **#17** — MCP: expand tools for creative scheduling (blocked by #3, #4)

## Conflict Prevention Rules

- Each track works on its own feature branch
- No two tracks edit the same file
- `domain/src/services/mod.rs` — only Track A adds to it during parallel phase; iCal (#15) adds to it during the sequential tail after Track A is merged
- `domain/src/lib.rs` — re-exports may need updating at merge time; resolve in merge commit
- Run `cargo check --workspace` after each merge before starting the next

## Worktree Setup

```bash
git worktree add .worktrees/schedule-engine -b feat/schedule-engine
git worktree add .worktrees/playout -b feat/playout
git worktree add .worktrees/library-sync -b feat/library-sync
```

Each worktree starts from the same master commit. Work independently. Merge back to master one at a time.