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

plugins/kyberforge/.apm/skills/agent-author/references/README.md

@@ -4,14 +4,52 @@ source_keys: []
 
 # references/
 
+## create.md
+
+The create flow, loaded from SKILL.md Step 1 when no agent file exists at the target path.
+Covers: prerequisites, the scaffold script and its scope walk-up, what to fill in at every scope,
+and populating or deleting the package-root `sources.md`.
+
+## improve.md
+
+The improve flow, loaded from SKILL.md Step 1 when a file exists and at least one improvement
+signal is present. Covers: signal verification, partial-pair recovery, root-cause grouping,
+generalizing rather than patching, delegation over growth, and the ADR-0020 retrofit rule.
+
+## contract.md
+
+The description and body contract, loaded from SKILL.md Step 3 before any description is written
+or any body restructured. Covers: the three-part description shape, banned description content,
+boundary-target resolution, the 250/400 length tiers, the body role-instruction pattern, the
+delegation rule that replaces a body word gate, and the invocation axis.
+
+## plugin-scope.md
+
+Field rules and the pre-audit checklist for the single vendor-neutral `.apm/agents/<name>.agent.md`
+file. Loaded from SKILL.md Step 2 when the scaffold resolves plugin/APM scope.
+
+## project-user-scope.md
+
+Field rules and the pre-audit checklist for the Claude Code `.md` + Copilot `.agent.md` pair,
+including the two distinct Copilot formats. Loaded from SKILL.md Step 2 when the scaffold resolves
+project or user scope.
+
 ## deployment-modes.md
 
-Agent scope hierarchy, precedence rules, and per-scope restrictions. Covers: which frontmatter fields a plugin/APM-scope agent may carry and the allowlist-vs-denylist shape rule that decides it (deferring to `agent-audit`'s `references/field-inventory.md` for the list itself), scoped identifiers for plugin subdirectory agents, cache isolation behaviour, and Copilot CLI path conventions. Loaded conditionally from SKILL.md when the destination is a plugin directory.
+Scope hierarchy and precedence, scoped identifiers for plugin subdirectory agents, cache isolation
+behaviour, and Copilot CLI path conventions. Loaded from SKILL.md Step 2 when precedence, paths or
+cache isolation matter to the run.
 
 ## scripts.md
 
-Conventions for the `new-agent.sh` scaffold script and any future scripts added to this skill. Covers: what scripts should and should not do, file placement, error handling, template variable conventions, and the no-interactive-prompts rule.
+Conventions for the `new-agent.sh` scaffold script, the templates it copies, and any future script
+in this skill. Loaded from `create.md` Step 1 when the script or a template has to change. Covers:
+the no-interactive-prompts rule, structured output, idempotency, template variables, file
+placement, error messages, and the no-restated-field-roster rule that `tests/new-agent.bats`
+enforces.
 
 ## sources.md
 
-Research provenance record for this skill. Lists the upstream research sources (claude-code-plugins and github-copilot-plugins research docs) that informed SKILL.md, the templates, and the deployment-modes reference. Used by `skill-audit` to validate the provenance chain.
+Research provenance record for this skill. Lists the upstream research sources
+(claude-code-plugins and github-copilot-plugins research docs) that informed SKILL.md and the
+reference files. Used by `skill-audit` to validate the provenance chain.