feat(kyberforge): add instructions-author skill for .apm/instructions files

Scaffolds and revises apm instructions files, with a throwaway-package
verification recipe because `apm compile --validate` always exits 0 and
Claude Code drops `description`. Routed from forge and linked from
apm-workflow's compile reference. Bumps kyberforge to 2.1.0 and the catalog
to 0.5.2.

Fixes #148

Co-Authored-By: Claude Code <[email protected]>
Claude-Session: https://claude.ai/code/session_01KkT7RSDwDbmrM9T34b6sTi

plugins/kyberforge/.apm/skills/instructions-author/references/verify.md

@@ -0,0 +1,32 @@
+---
+source_keys:
+  - apm-cli-0-28-0-experiments
+---
+
+# Verifying a file in a throwaway package
+
+Reached from `SKILL.md` Step 3. Run step 2 outside the repo: `apm install` writes `apm_modules/`, `apm.lock.yaml` and a rules directory, and install overwrites hand-authored rule files without warning.
+
+1. From the package root, a real compile, never `--validate`:
+
+   ```bash
+   apm compile --dry-run --target claude
+   ```
+
+   Resolve every warning it prints: missing `description`, missing `applyTo`, empty content, broken link, "Failed to parse".
+
+2. For a scoped rule, deploy it where nothing else can be overwritten:
+
+   ```bash
+   d=$(mktemp -d)
+   printf 'name: scratch\nversion: 0.1.0\ntype: instructions\ntargets:\n  - claude\n' > "$d/apm.yml"
+   mkdir -p "$d/.apm/instructions"
+   cp <package-root>/.apm/instructions/<name>.instructions.md "$d/.apm/instructions/"
+   (cd "$d" && apm install && cat .claude/rules/<name>.md)
+   ```
+
+3. The deployed file must open with `paths:` listing the intended globs. No frontmatter block at all means `applyTo` was missing or did not parse: the rule would load in every session.
+
+4. To check the compiled root file instead, compile in that same clean directory *before* installing, or pass `--force-instructions`; after an install, `--target claude` writes nothing.
+
+Delete the directory afterwards. Report only what was observed; Cursor's list-form `globs` and the Windsurf, Kiro and Antigravity runtimes stay unverified.