fix(kyberforge): resolve PR #144 review and audit round 1

- factory-audit: no-op hooks, ./ after interpreters, split-quote and
  spaced ${PLUGIN_ROOT} paths, camelCase events in Claude-targeted flat
  files, case-insensitive routing stems, and non-string YAML keys are
  now caught; input: forms and prompt boundary clauses align with
  primitive-author; bats 347 -> 367
- primitive-author: routing forms, quoting guidance, install exit on
  hidden Unicode, argument-hint exception
- forge: drop duplicated gotcha, fit description and body budgets (#143)
- skill-author: primitive-author boundary, Claude-only env vars
- hook: exit unless CLAUDE_PROJECT_DIR is set, so Copilot/Codex never
  run apm update; ADR-0019 correction, ADR-0025 amendment, docs fixes

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

plugins/kyberforge/.apm/skills/primitive-author/references/prompt.md

@@ -59,7 +59,8 @@ Should:
 6. The description follows the contract above: one plain sentence, no trigger or boundary clause,
    naming the skills or agents it steers.
 7. Spell keys in kebab-case — `allowed-tools`, `argument-hint` — not the camelCase aliases.
-8. Omit `argument-hint` when `input:` is set; apm synthesises `<a> <b>` from the input names.
+8. Omit `argument-hint` when `input:` is set, unless the `<a> <b>` form apm synthesises from the
+   input names is inadequate; an explicit `argument-hint` wins.
 9. Keep one intent per prompt, and write the body as second-person instructions.
 10. Keep `description` to 250 characters or fewer.
 11. Give `model` a slug the target accepts. Copilot ignores `allowed-tools` and `model`, so neither