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/SKILL.md

@@ -15,7 +15,7 @@ metadata:
 
 ## Gotchas
 
-- `apm compile --validate` is not a gate: it reports instruction problems only as warnings, exits 0, and never reads prompts. `apm install` fails only on a hook payload Copilot would reject, and merely warns on bad prompt input names and dropped keys — `/factory-audit` is the only check that fails on the rest.
+- `apm compile --validate` is not a gate: it only warns on instructions, exits 0, and never reads prompts. `apm install` exits 1 only on a hook payload Copilot would reject or on critical hidden Unicode, which also blocks the package's deployment; bad prompt input names and dropped keys merely warn — `/factory-audit` is the only check that fails on the rest.
 - Never draft with the real suffix outside `.apm/<type>/`. apm's local discovery globs `**/*.instructions.md` across the whole tree, so a draft or template named that way anywhere in the repo is picked up as a real instruction. The templates carry a trailing `.template` for this reason; drop it only on the final path.
 - Never hand-write `.claude/settings.json`, even to test a hook. apm owns that file (ADR-0019), overwrites it outright when it is malformed, and `apm audit --ci` fails on anything it would not have written.