docs: plan the report implementation

Thirteen tasks, TDD throughout. Task 1 changes parse.py to store a whitelist
of publishable headers, which is what lets report never open source.eml, and
Task 13 re-runs both sweeps with a third assertion covering generated bodies.

Two spec items deliberately have no task and are recorded as gaps: api
destination bodies belong to the submit spec, and writing the frozen marker
is submit's work.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Xj1ayFRSUQ2u7cwb3S4axE

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