fix(gates): report an unparsed routing clause beside a parsing sibling

boundary_clause_status() ran BOUNDARY_ARROW.search() and _arrow_targets()
over the whole description, so one arrow clause that parsed suppressed the
diagnostic for every other clause in it. A backticked hyphenated routing
target wrapped across lines in a folded scalar was therefore silently
unchecked -- no error, no suggestion, exit 0 -- whenever the description
carried one other clause that parsed. Written bare, the same wrap errors
correctly. That is the shape #100 regressed on.

The check is now per clause. Nothing that passed starts failing: all 68
routing targets across the 38 SKILL.md files resolved before and still do.
26 of those descriptions carry more than one arrow clause, so the
suppression was live across two thirds of the corpus, not an edge case.

validate-skill.bats pins the shape. test-adr0020-targets.sh's comment
described the #100 regression as a backticked wrap; the historical text was
unbackticked, which is precisely the shape the gate did not catch.

Also closes three README misroutes the branch left in the enforcement
layer: CompositionNote.yml's message, agent-description-quality.md:58 and
vale-wrap.sh's header still sent overflow to a skill-root README.md and
named the two skills ADR-0025 merged away. 1ec3e8a fixed the prose and
missed the rules that enforce it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NwD8Egs5r4ndqeFLmhusX2

plugins/kyberforge/.apm/skills/factory-audit/references/agent-description-quality.md

@@ -55,7 +55,8 @@ A model-invoked description carries exactly three things:
 3. **Boundary clause.** Compressed form: `Not <thing> -> <skill-name>.` The target must resolve to
    a real skill directory or agent file in the authoring source.
 
-Everything else belongs in the body or in the plugin's `README.md`.
+Everything else belongs in the body or in a `references/` file. Not a `README.md`: `plugins/gitea/`
+and `plugins/lint/` both ship agents this file governs and neither has one.
 
 ## Indirect triggers — conditional, never blanket