Capstone Session Step 2: Fix, Green

The fix, as a real diff against step 1 (one line):

--- attempt1.py
+++ attempt2.py
@@ -1,10 +1,10 @@
-"""Capstone attempt 1: parse_duration -- convert an "1h30m"-style duration string to total seconds."""
+"""Capstone attempt 2 (fixed): parse_duration -- "1h30m"-style duration string to total seconds."""
 from __future__ import annotations
 
 import re
 
 _TOKEN = re.compile(r"(\d+)([hms])")
-_UNIT_SECONDS: dict[str, int] = {"h": 3600, "m": 600, "s": 1}
+_UNIT_SECONDS: dict[str, int] = {"h": 3600, "m": 60, "s": 1}
 
 
 def parse_duration(s: str) -> int:

Review before accepting: a one-line diff, touching only the "m" value in _UNIT_SECONDS -- scoped exactly to the rejected bug from step 1, no unrelated hunks (co-15: this is the same scope-check ex-30 · catch-silent-scope-creep teaches, applied here to the agent's own follow-up diff). Accepted only after re-running the full suite, not on inspection alone.

Run: python3 -m pytest test_parse_duration.py -q

Output (genuine, captured transcript):

.......                                                                  [100%]
7 passed in 0.00s

Verify: all seven acceptance-criteria tests from prompt.md now pass -- a real, captured green run, following a real, captured red run (step 1) -- the red-to-green transition co-13/co-14 require before any "done" claim.

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