Annotate B5 / C5 / M3 / M6 subsections with 2026-04-20 update pointers: B5 is unblocked and scaffolded today (tests/eval/); C5 / M3 / M6 execution unblocks progressively as fixtures accumulate against the B5 harness.
Annotate B5 / C5 / M3 / M6 subsections with 2026-04-20 update pointers: B5 is unblocked and scaffolded today (tests/eval/); C5 / M3 / M6 execution unblocks progressively as fixtures accumulate against the B5 harness.