# Review by Linus Torvalds (Round 1)

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VERDICT: approve

FINDINGS:
- [tests/test_cli.py]: Test helper `_simulate_completion_reactions()` duplicates cli.py logic rather than calling the actual code path. Acceptable tradeoff for testability, but worth noting: if cli.py diverges from this pattern, tests won't catch it.
- [src/colonyos/cli.py]: Both completion blocks are now identical 9-line sequences. If a third completion path appears, consider extracting to a shared function. Not now — two is not a pattern.

SYNTHESIS:
This is the simplest possible implementation of the requirements. Four source files touched, +373/-1 lines (168 of which are tests), zero lines of existing logic changed beyond adding the `remove_reaction` import and the Protocol method. The data flow is obvious: remove old emoji, add new emoji, optionally add celebratory emoji. Each step is independently guarded against failure with `logger.debug()` logging. The code follows every existing convention in the codebase — the `remove_reaction()` helper is a structural clone of `react_to_message()`, the Protocol addition mirrors `reactions_add`, and the cli.py blocks use the same try/except pattern as every other Slack API call. All 7 PRD requirements are implemented. All 15 new tests pass. No cleverness, no premature abstraction, no unnecessary dependencies. Ship it.
