fix(kyberforge): align primitive-author and factory-audit rule tiers

Second clean-context audit found author Must/Should and audit FAIL/SUGGESTION
tiers drifting apart, and author Musts the audit never checked.

- factory-audit: FAIL on absolute or bare relative hook script paths, an
  applyTo present but empty, and unbalanced braces/brackets in applyTo;
  judgment steps for dependency stem collisions, helper .json in hook dirs,
  unresolvable instruction links, prompt model slugs and second-person
  bodies; an unmatched glob drops to SUGGESTION; deliberate tier deviations
  recorded in hook-flow.md; validate.sh --help lists the three new modes;
  DescriptionOpener message no longer prescribes "Use when".
- primitive-author: deprecated routing, extra prompt keys and the prompt
  description contract become Shoulds; hook Musts gain "contributes an
  entry", no bare relative paths, and executable-when-run-directly;
  prompt Must 1 covers hardlinks; Vale prose FAILs resolved at close.
- forge: say "hook, instruction or prompt" rather than "apm primitive".

Refs #94

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KkT7RSDwDbmrM9T34b6sTi

plugins/kyberforge/.apm/skills/forge/SKILL.md

@@ -36,7 +36,7 @@ Match the grilled intent against exactly one row — or more than one, if the in
 |---|---|---|---|
 | A reusable capability the agent loads inline in the main conversation, triggered by description-matching, free to bundle its own `references/`, `scripts/` or `assets/` | Skill | `skill-author` | `references/author-routes.md` |
 | A recurring task needs its own reusable definition — dedicated system prompt, tools and description, invokable by name across sessions | Agent / subagent | `agent-author` | `references/author-routes.md` |
-| A runtime callback at a harness event, a rule scoped to a file pattern, or a reusable user-typed message steering existing skills | Hook / instruction / prompt (apm primitive) | `primitive-author` | `references/author-routes.md` |
+| A runtime callback at a harness event, a rule scoped to a file pattern, or a reusable user-typed message steering existing skills or agents | Hook / instruction / prompt | `primitive-author` | `references/author-routes.md` |
 | A new distributable unit — no existing plugin is the right home for the skill, agent, hook or MCP server being built, or the bundle needs its own manifest, versioning and install lifecycle | Plugin | `apm-workflow` (`apm plugin init`) | `references/apm-routes.md` |
 | The plugin already exists and only its marketplace-facing metadata changes — a first listing, or a version/description update, never the plugin's contents | Marketplace entry | `apm-workflow` (`apm marketplace package add`) | `references/apm-routes.md` |