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>

src/runtime-artifact-conversion.cts

@@ -1648,7 +1648,7 @@ Typed mapping (agent_type-capable schema only):
   to \`spawn_agent\` when the runtime/tool supports it. Omit missing, empty,
   inherited, or unsupported values; do not invent one-off effort literals in
   workflow prose.
-- \`fork_context: false\` by default — GSD agents load their own context via \`<files_to_read>\` blocks
+- \`fork_context: false\` by default — GSD agents load their own context via \`<required_reading>\` blocks
 - \`task_name\` — required by the collaboration schema; provide a descriptive name for each spawned task
 - \`fork_turns\` — optional parameter controlling turn-forking depth; coexists with \`fork_context\` (not a replacement)
 - \`Task(isolation="worktree")\` / \`Agent(isolation="worktree")\` → no direct \`spawn_agent\` mapping,