# Review by Linus Torvalds (Round 3)

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## Review Complete — Linus Torvalds (Round 3)

**27 tests pass. 49 parallel tests pass. All 10 functional requirements implemented.**

### The short version: Ship it.

The code is correct because the data structures are correct. Three disjoint sets (`completed`, `failed`, `blocked`) track task state with O(1) lookups. A linear loop walks topological order, checks dependencies, runs an agent, commits, moves on. No state machines, no fancy abstractions. Just the obvious thing.

### What's good:
- **Config flip is minimal** — two defaults changed, one warning added, existing tests updated. Clean.
- **Sequential runner is ~240 lines** with a clear linear flow: parse DAG → iterate topo order → check blocked → run agent → selective stage → commit
- **Security fix is proper** — `git add -A` replaced with `git diff --name-only` + `_is_secret_like_path()` filtering. Reuses existing infrastructure instead of inventing new patterns.
- **DAG-aware failure handling works** — failed tasks propagate BLOCKED to dependents, independent tasks continue

### Minor gaps (not blockers):
1. **`_inject_memory_block()` not wired into sequential path** — semantic memory store queries are missing. Learnings ARE included via `load_learnings_for_injection()`, so this is additive, not a regression.
2. **`_drain_injected_context()` not called** — Slack/GitHub external context doesn't reach per-task prompts. Same story — additive feature gap.
3. **Completed tasks context grows linearly** — fine for 3-5 tasks, worth trimming for 10+.
4. **`_setup_repo` duplicated** between two test classes — minor cleanup.

VERDICT: **approve**

FINDINGS:
- `[src/colonyos/orchestrator.py]`: `_inject_memory_block()` (semantic memory store) not wired into sequential per-task path
- `[src/colonyos/orchestrator.py]`: `_drain_injected_context()` (Slack/GitHub injection) not called in sequential path
- `[src/colonyos/orchestrator.py]`: "Previously Completed Tasks" context grows linearly — trim for 10+ task chains
- `[tests/test_sequential_implement.py]`: `_setup_repo` helper duplicated between two test classes

SYNTHESIS:
This is a clean, well-scoped change that does exactly what it says: flip the default from parallel to sequential, implement a per-task sequential runner with proper DAG ordering and failure isolation, and keep parallel as opt-in. The code is straightforward — no premature abstractions, no clever tricks. The data structures are simple sets and dicts, the control flow is a linear loop, and the security fix properly addresses the `git add -A` vulnerability by reusing existing infrastructure. Two feature gaps exist (memory store and injection context not wired into the sequential path), but these are additive improvements, not regressions. 27 new tests cover the core logic thoroughly. Ship it.