fix(#3423): standardize on <required_reading>, retire the files_to_read emit tag (#3432)
* fix(#3423): standardize on required_reading, retire files_to_read emit tag
* test(#3423): flip tag assertions, extend consistency guard to spawner surfaces
* fix(#3423): sweep capabilities fragments, regen registry+skills, anchor executor test
* chore(#3423): acknowledge tag-rename emitted ripples and workflow growth
* chore(#3423): broaden emitted-ripple acknowledgment to all embedders
* chore(#3423): settle emitted-drift acks post-rebase (merge 3004/1689-owned keys)
* chore(#3423): drop stale ripple acks, ack execute-phase growth
* chore(#3423): restore pristine 3004 fragment, keep only consumed appends
* chore(#3423): backfill changeset pr number
* chore(#3423): settle emitted-drift acks post-merge (move code-review-fix ripple into 3190, tag-rename ripples into 3191/3297)
* chore(#3423): re-arm 3324 ack for execute-phase.md tag-rename ripple
* fix(#3423): trim 8 bytes from execute-phase model note to hold ADR-857 margin, re-arm 3370 ack for net +4 growth
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Co-authored-by: sim <sim@local>
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