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

---------

Co-authored-by: sim <sim@local>

capabilities/pattern-mapper/fragments/plan-pre.md

@@ -3,10 +3,10 @@
 **Phase directory:** {phase_dir}
 **Padded phase:** {padded_phase}
 
-<files_to_read>
+<required_reading>
 - {context_path} (USER DECISIONS from /gsd:discuss-phase)
 - {research_path} (Technical Research)
-</files_to_read>
+</required_reading>
 
 **Output file:** {phase_dir}/{padded_phase}-PATTERNS.md