Service tests walk Planning -> Active -> Closed -> Active and
confirm rejects on out-of-order transitions. Close rejects when
applied zero is nonzero; succeeds when balanced; reopens cleanly.
Route tests confirm each endpoint's status codes, HX-Redirect
headers, and that the page renders the right badge and button per
state. Closed months reject every mutation with 400 and their
rendered HTML carries disabled inputs without add forms or delete
buttons.
Refs #15
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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