Single-iter plan implementing the rpe.1 spec. Ten tasks:
RED test, 92 .ail corpus migration, 6 .prose.txt regen,
four-site compiler deletion, five test-body migrations,
six doc-comment touch-ups, seven DESIGN.md sites, three E2E
comment touch-ups, bench ratification (per spec §C4 (a)),
and the close-out (roadmap strike, journal, stats).
Plan absorbs four spec-vs-code mismatches surfaced by recon
(one install-test instead of three, 92/6 fixture split rather
than 98, synth.rs:215 parallel registry, incidental test-body +
doc-comment sites) as an "Errata vs. spec" block at the top of
the plan; the spec itself is unchanged because none of the
mismatches affect load-bearing invariants.
Brummel
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