feat(kyberforge): enforce the ADR-0020 context contract for skills and agents

Skill name+description pairs are preloaded into every session, costing
~6,200 tokens across 39 skills before any skill is invoked. The authoring
rules mandated that growth: skill-author:104 and description-quality.md:21
both required padding, while skill-author:102 (the deflating rule) had no
FAIL condition behind it.

Gates (blocking, no baseline file):
- description 250 chars SUGGESTION / 400 FAIL, measured on the folded
  YAML value
- body-only 600 words SUGGESTION / 900 FAIL, independent of the unchanged
  whole-file 2770-word / 500-line spec backstop
- every boundary-clause routing target must resolve to a real skill or
  agent; catches skill-improve, neuledge-context and gitea-labels
- agents take the description gates but deliberately no body gate; a test
  pins that absence

Vale: DescriptionOpener widened to ^This\b, new CompositionNote rule
banning architecture notes from descriptions. 10 hits, 0 false positives.

Kyberforge's own four skills retrofitted: descriptions 3,364 -> 938 chars
(-72%), bodies 8,306 -> 2,487 words (-70%), all via the apm-workflow
dispatch pattern. Fixes the skill-improve dangling route and the
agent-author misroute to manual review.

Also fixes a pre-existing false positive where any line-initial 'read '
was flagged as interactive input, which had already caused two scripts to
be rewritten around it.

Refs: ADR-0020

.pre-commit-hooks.yaml

@@ -13,8 +13,11 @@
     files: '(^|/)agents/[^/]+\.md$|\.agent\.md$'
 
 -   id: kyberforge-skill-size-check
-    name: SKILL.md size ceiling
-    description: Enforce agentskills.io's 500-line/5,000-token SKILL.md size ceiling
+    name: SKILL.md size and context-budget ceilings
+    description: Enforce agentskills.io's 500-line/2,770-whole-file-word spec ceilings plus ADR-0020's context budget (description 250 chars SUGGESTION / 400 FAIL, body-only 600 words SUGGESTION / 900 FAIL, resolvable boundary-clause routing targets)
     entry: scripts/skill-size-check.sh
     language: script
     files: '(^|/)SKILL\.md$'
+    # verbose so the SUGGESTION tier reaches a human -- pre-commit prints
+    # nothing for a passing hook, and a SUGGESTION deliberately does not fail.
+    verbose: true