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/skills/agent-author/references/sources.md

@@ -19,7 +19,7 @@ source_keys:
 - **URL:** context7:/websites/code_claude
 - **Research doc:** plugins/kyberforge/docs/research/docs/claude-code-plugins/sources.md
 - **Description:** Official Claude Code documentation site indexed by Context7 — plugin manifest schema, subagent definition types, marketplace JSON format, agent markdown file format
-- **Contributing files:** SKILL.md, references/deployment-modes.md
+- **Contributing files:** SKILL.md, references/create.md, references/deployment-modes.md, references/plugin-scope.md
 - **Status:** `extracted`
 
 ## claude-code-plugins-docs
@@ -27,7 +27,7 @@ source_keys:
 - **URL:** https://code.claude.com/docs/en/plugins
 - **Research doc:** plugins/kyberforge/docs/research/docs/claude-code-plugins/sources.md
 - **Description:** Official Claude Code plugin authoring guide — plugin structure, manifest fields, loading methods, skill namespacing, agent activation, marketplace submission
-- **Contributing files:** SKILL.md, references/deployment-modes.md
+- **Contributing files:** SKILL.md, references/deployment-modes.md, references/plugin-scope.md
 - **Status:** `extracted`
 
 ## claude-code-subagents-docs
@@ -35,7 +35,7 @@ source_keys:
 - **URL:** https://code.claude.com/docs/en/sub-agents
 - **Research doc:** plugins/kyberforge/docs/research/docs/claude-code-plugins/sources.md
 - **Description:** Official Claude Code subagent reference — definition format, all frontmatter fields, scope priority, built-in agents, CLI flags, environment variables, known limitations
-- **Contributing files:** SKILL.md, references/deployment-modes.md
+- **Contributing files:** SKILL.md, references/create.md, references/improve.md, references/contract.md, references/deployment-modes.md, references/project-user-scope.md
 - **Status:** `extracted`
 
 ## context7-github-en-copilot
@@ -43,7 +43,7 @@ source_keys:
 - **URL:** context7:/websites/github_en_copilot
 - **Research doc:** plugins/kyberforge/docs/research/docs/github-copilot-plugins/sources.md
 - **Description:** Official GitHub Copilot documentation indexed by Context7; covers CLI plugins, custom agents, SDK, and marketplace
-- **Contributing files:** SKILL.md, references/deployment-modes.md
+- **Contributing files:** references/deployment-modes.md, references/project-user-scope.md
 - **Status:** `extracted`
 
 ## github-custom-agents-configuration
@@ -51,7 +51,7 @@ source_keys:
 - **URL:** https://docs.github.com/en/copilot/reference/custom-agents-configuration
 - **Research doc:** plugins/kyberforge/docs/research/docs/github-copilot-plugins/sources.md
 - **Description:** Reference for cloud and IDE custom agent definition format — frontmatter fields, tool aliases, MCP server config, secrets interpolation, scoping hierarchy
-- **Contributing files:** SKILL.md, references/deployment-modes.md
+- **Contributing files:** references/contract.md, references/deployment-modes.md, references/project-user-scope.md
 - **Status:** `extracted`
 
 ## github-cli-plugin-reference
@@ -59,7 +59,7 @@ source_keys:
 - **URL:** https://docs.github.com/en/copilot/reference/copilot-cli-reference/cli-plugin-reference
 - **Research doc:** plugins/kyberforge/docs/research/docs/github-copilot-plugins/sources.md
 - **Description:** Full CLI plugin reference — plugin.json schema, marketplace.json schema, all CLI commands and flags, install specification formats, loading precedence, env vars, LSP config
-- **Contributing files:** SKILL.md, references/deployment-modes.md
+- **Contributing files:** references/deployment-modes.md, references/project-user-scope.md
 - **Status:** `extracted`
 
 ## github-plugins-creating
@@ -67,7 +67,7 @@ source_keys:
 - **URL:** https://docs.github.com/en/copilot/how-tos/copilot-cli/customize-copilot/plugins-creating
 - **Research doc:** plugins/kyberforge/docs/research/docs/github-copilot-plugins/sources.md
 - **Description:** How-to for creating Copilot CLI plugins — plugin structure, agent and skill authoring, hooks format, MCP config, development lifecycle
-- **Contributing files:** SKILL.md
+- **Contributing files:** references/create.md
 - **Status:** `extracted`
 
 ## github-plugins-finding-installing