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/primitive-author/references/hook.md

@@ -47,7 +47,8 @@ target:
 
 - **`${PLUGIN_ROOT}`** is the target-neutral token; apm rewrites it per target
   (`"${CLAUDE_PROJECT_DIR}/.claude/hooks/<pkg>/…"` on Claude, repo-relative elsewhere).
-  `${CLAUDE_PLUGIN_ROOT}` also works but ties the source to one harness's name.
+  `${CLAUDE_PLUGIN_ROOT}` is rewritten identically, so it is valid, but it ties the source to one
+  harness's name (Should 12).
 - **Claude is the verified target.** apm 0.28.0 passes this nested shape to Copilot without
   reshaping it, and whether Copilot CLI runs nested entries or honours `matcher` is unverified. That
   gap is apm's to close. Per-file target routing is deprecated, so a Copilot-native flat hook
@@ -59,20 +60,23 @@ target:
 Must:
 
 1. The file sits directly in `.apm/hooks/`, is not a symlink, and parses as a JSON object. apm
-   skips invalid JSON silently.
+   skips invalid JSON silently. (apm also discovers a package-root `hooks/`, and `factory-audit`
+   accepts it for third-party packages; author in `.apm/hooks/`.)
 2. Use the wrapped shape `{"hooks": {Event: [...]}}`. If a naked settings slice is used instead,
    every top-level value must be a list, with no stray scalar keys anywhere.
 3. Every event value is a list of objects, and every nested `hooks` is a list of objects. Anything
-   else fails the Copilot install outright.
+   else fails the Copilot install outright. The file contributes at least one entry: an empty one
+   deploys nothing, with only a warning.
 4. Event names are PascalCase (`PreToolUse`, `PostToolUse`, `UserPromptSubmit`, `SessionStart`,
    `Stop`, …). An all-lowercase name (`stop`) never warns and never fires; a camelCase name outside
    apm's rename map (`userPromptSubmit`) deploys verbatim to Claude and never fires.
-5. The script is referenced as `${PLUGIN_ROOT}/…` (package root) or `./…` (hook directory),
-   exists inside the package, and is executable. No absolute path, and no `$` or backtick in the
-   path itself. A missing script is only a warning at install time. Executable is stricter than the
-   research's Should: a script invoked as the command's first token fails at runtime without it.
-6. No `hooks-<target>` or `*-<target>-hooks` filename. That routing is deprecated; reach belongs to
-   `targets:` (see Gate).
+5. The script is referenced as `${PLUGIN_ROOT}/…` (or `${CLAUDE_PLUGIN_ROOT}/…`, see Shape) for
+   the package root, or `./…` for the hook directory, and exists inside the package. No absolute
+   path and no bare relative path (`scripts/x.sh`): apm bundles and rewrites neither. No `$` or
+   backtick in the path itself. A missing script is only a warning at install time.
+6. A script run directly as the command's first token is executable. This is stricter than the
+   research's Should: without it the hook fails every time it fires. A script passed to an
+   interpreter (`bash ${PLUGIN_ROOT}/x.sh`) needs no executable bit.
 
 Should:
 
@@ -85,3 +89,6 @@ Should:
 10. Quote a script path that may contain spaces: `"${PLUGIN_ROOT}/scripts/my hook.sh"`.
 11. Keep helper files in the hook directory non-JSON. Copilot's loader rejects any bundled `.json`
     without a `hooks` key.
+12. Prefer `${PLUGIN_ROOT}` over `${CLAUDE_PLUGIN_ROOT}`.
+13. No `hooks-<target>` or `*-<target>-hooks` filename. That routing is deprecated and reach belongs
+    to `targets:` (see Gate); the research allows it only when deprecated routing is intended.

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

@@ -35,7 +35,8 @@ Must:
 2. `description` is a non-empty string. apm only warns when it is missing.
 3. The body is non-empty after trimming whitespace. apm deploys an empty rule silently.
 4. `applyTo` is a non-empty glob or comma-separated list — top-level commas only as separators,
-   alternation inside `{}` (`"**/*.{ts,tsx}"`) — or absent after the Gate's explicit yes.
+   alternation inside `{}` (`"**/*.{ts,tsx}"`), braces and brackets balanced — or absent after the
+   Gate's explicit yes. An empty `applyTo: ""` is neither.
 5. The stem is unique across the package and its dependencies: a `.claude/rules/<stem>.md`
    collision is silently overwritten.
 
@@ -48,5 +49,6 @@ Should:
 8. Put any rationale Claude needs in the body. `description` never reaches Claude — it survives only
    for Copilot and as Cursor's index text.
 9. Keep relative markdown links resolvable from the source file.
-10. Check the glob against the tree: one that matches nothing never fires, and one broader than the
-    rule's real scope spends context on every file it touches.
+10. Check the glob against the tree: one that matches nothing here fires only in consumer repos
+    that have such files, and one broader than the rule's real scope spends context on every file
+    it touches.

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

@@ -40,25 +40,27 @@ Copy `assets/templates/name.prompt.md.template` and drop `.template` only on the
 
 Must:
 
-1. The path is `.apm/prompts/<name>.prompt.md`, directly in that directory, not a symlink. `<name>`
-   is a safe path segment and unique across `.apm/prompts/` and the package root; it becomes the
-   Copilot filename and the Claude `/command` name.
-2. `description` is present and non-empty, per the contract above.
+1. The path is `.apm/prompts/<name>.prompt.md`, directly in that directory, not a symlink or
+   hardlink. `<name>` is a safe path segment and unique across `.apm/prompts/` and the package
+   root; it becomes the Copilot filename and the Claude `/command` name.
+2. `description` is present and non-empty.
 3. Every `input:` name matches `^[A-Za-z][\w-]{0,63}$`, written in the object form
    `- pr_number: "The PR to review"`. Never copy apm's published `- name: pr_number` /
    `description: …` example: apm reads the map's keys, so it produces the arguments `name` and
    `description`.
 4. Every `${input:x}` in the body is declared in `input:`, and every declared name is used. Without
    `input:`, no `${input:…}` may appear — it would reach Claude unrewritten.
-5. Frontmatter keys stay within `description`, `allowed-tools`, `model`, `argument-hint` and
-   `input`. Claude drops everything else with only a warning. The one exception: a Copilot-only key
-   (`agent`, `tools`, …) that is intended, with its Claude drop accepted and said so.
 
 Should:
 
-6. Spell keys in kebab-case — `allowed-tools`, `argument-hint` — not the camelCase aliases.
-7. Omit `argument-hint` when `input:` is set; apm synthesises `<a> <b>` from the input names.
-8. Keep one intent per prompt, and write the body as second-person instructions.
-9. Keep `description` to 250 characters or fewer.
-10. Give `model` a slug the target accepts. Copilot ignores `allowed-tools` and `model`, so neither
+5. Frontmatter keys stay within `description`, `allowed-tools`, `model`, `argument-hint` and
+   `input`. Claude drops everything else with only a warning. The exception: a Copilot-only key
+   (`agent`, `tools`, …) that is intended, with its Claude drop accepted and said so.
+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.
+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
     constrains a Copilot run.