merge: main (wave 4 order A) into order B before B goes into main

Conflicts on the union lines only: CHANGELOG Unreleased (both orders'
entries kept), CLAUDE.md (/trekexecute row from A, /trekreview row from
B), tests/fixtures/jsonl-schemas.md (trekplan line_ref from B,
trekexecute line_ref from A). Suite on the merged tree 2682 (2680/0/2).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/skills-authoring.md

@@ -51,7 +51,10 @@ the 7 commands and the 21 spawnable agents, with no model:
 - Each skill has at least 3 prompts where it should fire, 2 where it should not, and 1 effect
   case. A firing prompt must rank the skill in the top 3; every one currently ranks it first, and
   that floor is held. A prompt where the skill should stay quiet names the command, agent or skill
-  that owns it, and that owner must rank higher.
+  that owns it, and that owner must rank higher. The owner may also be one of Claude Code's own
+  skills on a short fixed list in `routing.mjs` (`BUILTIN_OWNERS`, only `run` for now). Such an
+  owner is outside the corpus, so only "not taken" is checked: the skill must not rank first, and
+  the report says so for each such case.
 - The thresholds are pinned in `tests/lib/skill-routing.test.mjs` and never lowered. A failing case
   is fixed in a description, never in a number. You do not change another component's
   description to make room for yours.
@@ -72,6 +75,10 @@ tags: [skill-effect, skill=test-first, from=baseline-tfd-crash-red]
 ```
 
 `from=` names the event the case came from: a measured failure, a review finding, an analysis.
+It is required on every case in `evals/`, not only the skill cases: a case of the fixed test set
+(`tags: [proevesett, from=proevesett-eval-suite]`) has no skill tag, so it is not routed, but the
+routing test still fails it without `from=`. Its report gives both counts, cases checked for
+`from=` and cases routed.
 
 - A **skill-trigger** case has one grader: `type: tool_used`, `tool: Skill`, with an `input_match`
   that accepts `voyage:<name>` and the bare name.