Capstone: The Session

Capstone step 2 of 3 -- exercises co-04 (context management), co-12 (small reversible steps), co-13/co-14 (verification discipline, test-driven agent workflows), co-15/co-16 (diff review, hallucination awareness).

Context loaded for this session

Only two files were in scope for the whole session: the prompt (prompt.md, already reviewed) and the tripwire test (test_parse_duration.py, already reviewed and confirmed red). No other file in the repository was loaded -- there was nothing else this feature's logic depended on (co-04: the smallest context that can do the job, not the largest available).

The three small, independently revertible steps

1. Step 1: first attempt, rejected -- the agent's first generation is plausible, confident, and silently wrong. Caught by the tripwire test, not by reading the code.
2. Step 2: fix, green -- the one-line fix, reviewed, all seven acceptance-criteria tests pass.
3. Step 3: refactor, reviewed -- a small, behavior-preserving refactor (extract one helper function), reviewed again, tests still green.

Each step above is its own independently revertible commit-sized change (co-12): reverting step 3 alone leaves a working, green step-2 state; reverting steps 2 and 3 leaves the red step-1 state, never a half-applied mix.

Verify: every diff below was run against the real test suite before being accepted (co-13), and step 1's bad generation was caught and rejected with a specific, written reason (co-15, co-16) before any later step built on top of it.

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