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/factory-audit/scripts/validate.sh

@@ -196,7 +196,7 @@ TARGET="$1"
 if [[ ! -e "$TARGET" && ! -L "$TARGET" ]]; then
   echo "Error: '$TARGET' does not exist." >&2
   echo "  Why: the path shape says what would be audited, but there is nothing at this path to audit — and auditing a target that is not there would report the absence as findings about it, sending the reader after a spec violation instead of a typo." >&2
-  echo "  Fix: check the path, and pass an existing skill directory (or its SKILL.md) or an existing agent file." >&2
+  echo "  Fix: check the path, and pass an existing skill directory (or its SKILL.md), agent file, hook file (.json under a hooks/ directory), *.instructions.md or *.prompt.md." >&2
   exit 2
 fi
 
@@ -212,8 +212,8 @@ if [[ -d "$TARGET" ]]; then
     MODE=skill
   else
     echo "Error: '$TARGET' is a directory with no SKILL.md in it." >&2
-    echo "  Why: a skill directory is identified by its SKILL.md, and an agent target is a file, never a directory — so this path matches neither mode and guessing one would report findings of the wrong kind." >&2
-    echo "  Fix: pass the skill directory that holds SKILL.md, or an agent file (<name>.agent.md, or a .md file under an agents/ directory)." >&2
+    echo "  Why: a skill directory is identified by its SKILL.md, and every other target (agent, hook, instruction, prompt) is a file, never a directory — so this path matches no mode and guessing one would report findings of the wrong kind." >&2
+    echo "  Fix: pass the skill directory that holds SKILL.md, an agent file (<name>.agent.md, or a .md file under an agents/ directory), a hook file (.json under a hooks/ directory), a *.instructions.md or a *.prompt.md." >&2
     exit 2
   fi
 elif [[ "$TARGET_BASE" == "SKILL.md" ]]; then