Consolidate the scattered run instructions and pass/fail criteria into one place:
- design spec gains 'Running the spike' (venv bootstrap + flags + DB prereqs) and
'Definition of done' (Req 0-4 are the bar; coverage does not gate done-ness;
the only follow-up at ~100% CLIP coverage is one no-flag re-run to snapshot the
final coverage into the contract doc) sections, and the status line now reads
'passed 2026-06-27'.
- script docstring Usage now includes the missing 'python3 -m venv .venv' bootstrap
a fresh checkout needs, and points to the spec's definition of done.
m038
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