feat(kyberforge): enforce the ADR-0020 context contract for skills and agents

Skill name+description pairs are preloaded into every session, costing
~6,200 tokens across 39 skills before any skill is invoked. The authoring
rules mandated that growth: skill-author:104 and description-quality.md:21
both required padding, while skill-author:102 (the deflating rule) had no
FAIL condition behind it.

Gates (blocking, no baseline file):
- description 250 chars SUGGESTION / 400 FAIL, measured on the folded
  YAML value
- body-only 600 words SUGGESTION / 900 FAIL, independent of the unchanged
  whole-file 2770-word / 500-line spec backstop
- every boundary-clause routing target must resolve to a real skill or
  agent; catches skill-improve, neuledge-context and gitea-labels
- agents take the description gates but deliberately no body gate; a test
  pins that absence

Vale: DescriptionOpener widened to ^This\b, new CompositionNote rule
banning architecture notes from descriptions. 10 hits, 0 false positives.

Kyberforge's own four skills retrofitted: descriptions 3,364 -> 938 chars
(-72%), bodies 8,306 -> 2,487 words (-70%), all via the apm-workflow
dispatch pattern. Fixes the skill-improve dangling route and the
agent-author misroute to manual review.

Also fixes a pre-existing false positive where any line-initial 'read '
was flagged as interactive input, which had already caused two scripts to
be rewritten around it.

Refs: ADR-0020

AGENTS.md

@@ -43,6 +43,9 @@ Fall back to raw shell only when no skill covers it.
 - Install git hooks via `pc-run`, wiring all three stages — this repo's `.pre-commit-config.yaml` has no `default_install_hook_types`, so a plain install silently skips `commit-msg` (Conventional Commits) and `pre-push` (the 14-hook gate described below).
 - Install the `apm` CLI — four pre-push hooks shell out to it: `apm-marketplace-check`, `apm-audit-ci`, `apm-pack-check-clean`, and `check-plugin-content-sync` (via `scripts/sync-plugin-content.sh`, which wraps `apm pack`). `apm-marketplace-check` and `apm-pack-check-clean` are bare `apm …` hook entries and `apm-audit-ci` is a `bash -c` loop calling `apm` once per package, so without it the push dies with an unhelpful "command not found". Use `apm-install`, or `curl -sSL https://aka.ms/apm-unix | sh`; verify with `apm --version`.
 - Install `jq` — required by `scripts/check-manifests.sh` and `scripts/sync-plugin-content.sh`, both pre-push. These at least fail loudly (`Error: jq is required but not installed`).
+- Install `python3` — required by `scripts/skill-size-check.sh`, the `skill-size-check` pre-commit hook. It measures the *folded* `description` value: most descriptions here are `>`-block scalars, so a regex over the raw lines measures indentation and newlines instead of the value. Missing it fails the hook with an install pointer rather than skipping the ADR-0020 checks, which would be a vacuous green. In practice it is already present — pre-commit is itself a Python application. PyYAML is used when importable and is genuinely optional; a fallback reader covers the frontmatter shapes this corpus uses.
+- That hook enforces **two independent gate families** over `plugins/*/.apm/skills/*/SKILL.md`, and neither replaced the other. The agentskills.io spec backstop is unchanged: 500 lines and 2,770 words, counted over the **whole file including frontmatter**. ADR-0020 adds a context budget measured differently — `description` 250 chars SUGGESTION / 400 FAIL (it is preloaded into every session whether the skill fires or not), **body-only** word count 600 SUGGESTION / 900 FAIL (everything after the frontmatter's closing `---`), and every boundary-clause routing target resolving to a real skill or agent under `plugins/*/.apm/`. A file can sit well inside one family and fail the other. The hook is `verbose: true` so the SUGGESTION tier is audible — pre-commit prints nothing at all for a passing hook, and a SUGGESTION deliberately does not fail. `skill-audit`'s `validate.sh` holds a second copy of the four ADR-0020 constants; `tests/test-skill-size-check.sh` asserts the copies agree.
+- **Those ADR-0020 gates ship hot, with no baseline file.** 26 of 39 descriptions and 9 of 39 bodies currently exceed their FAIL tier, so editing one of those skills *for any reason* means retrofitting it to the contract first — a one-line fix to `gitea-prs` cannot be committed until that skill complies. This is deliberate, and the retrofit is tracked as Gitea issue #99. Check where a skill stands before starting: `pre-commit run skill-size-check --all-files`.
 - Install the `vale` binary — required by the `vale-audit-prefilter-skill`/`-agent` pre-commit hooks. Their `files:` patterns are `.apm/`-scoped: `^plugins/[^/]+/\.apm/skills/[^/]+/SKILL\.md$` and `^plugins/[^/]+/\.apm/agents/[^/]+\.agent\.md$`. Only the authoring source triggers them — a `SKILL.md` in the generated mirror matches neither pattern, so prose findings surface only when you edit the file you are supposed to be editing. Without the binary the hooks fail with a bare "command not found" and no install pointer. `brew install vale` (macOS), `snap install vale` (Linux), `choco install vale` (Windows), or see https://vale.sh/docs/vale-cli/installation/. No `vale sync` needed — the `Kyberforge` styles are committed under `plugins/kyberforge/.apm/skills/{skill-audit,agent-audit}/assets/vale/styles/`, not downloaded packages (see ADR-0014).
 - `vale` is also a **pre-push** dependency, not only pre-commit. `check-vale-style-sync` runs six glob-coverage probes by invoking `vale --config` — they are the only assertions in it that catch a `.vale.ini` glob typo, the failure mode where every text-level check stays clean while vale lints zero files. Missing `vale` is therefore a hard failure there. The opt-out is `CHECK_VALE_STYLE_SYNC_ALLOW_MISSING_VALE=1`, and it is **not** `SKIP=`: the hook still runs and still asserts everything verifiable from file text, but the six probes do not, and its summary says so explicitly — `Vale style sync check passed (text-level only, vale unavailable): … 0 glob probe(s) verified`. Use it only on a machine that genuinely cannot install `vale`, and read that summary line as "the glob axis was not checked", not as a pass.
 - Run `bash tests/run-tests.sh` before considering any change done — it runs every `test-*.sh` script in the repo plus the bats suite (`--bats-only` for just bats). First run auto-initializes the bats submodules; no manual `git submodule update` needed.
@@ -50,7 +53,7 @@ Fall back to raw shell only when no skill covers it.
 - `tests/run-bats.sh` derives the set of `.bats` files it expects from `git ls-files`, so a `.bats` file deleted from the worktree but still tracked in the index fails the run rather than silently shrinking the suite. Remove one with `git rm` (or stage the deletion) when the removal is intentional; an untracked new `.bats` file is picked up and needs no ceremony. Both discovery walks (`tests/run-bats.sh` and `tests/run-tests.sh`) exclude `apm_modules/`: `apm install` materializes a full copy of every plugin there, and running a dependency's copy of a `.bats` file breaks its relative path to the bats helpers — 167 spurious failures before the exclusion landed.
 - Pushing runs 14 repo-defined pre-push hooks, not just the test suite — `run-tests` and `check-manifests`, plus generated-content drift gates (`check-plugin-content-sync`, `check-marketplace-mirror-sync`, `check-vale-style-sync`, `check-scope-walkup-sync`, `check-executables-allow-sync`), artifact validators (`check-apm-agents-valid`, which runs agent-audit's `validate.sh` over every real `plugins/*/.apm/agents/*.agent.md`), apm's own gates (`apm-marketplace-check`, `apm-audit-ci`, `apm-pack-check-clean`), host validators (`validate-plugins`, `validate-marketplace`, both needing the `claude` CLI), and `check-release-needed`. `check-executables-allow-sync` is the odd one in that first group — it guards a silent failure rather than drift in generated text. apm gates a package's `hooks/` and `bin/` on an exact `<package>#<version>` lookup in root `apm.yml`'s `executables.allow`, with no wildcard and no version-less form, so bumping `plugins/kyberforge/apm.yml`'s `version:` without bumping the key errors nowhere: the entry simply stops matching, kyberforge's `SessionStart` hook stops deploying, and the install goes quietly stale — the failure ADR-0019 records as live. Run `pre-commit run --hook-stage pre-push --all-files` locally — one command, the whole gate. That command reports **16**, not 14: pre-commit's own `meta` hooks, `check-hooks-apply` and `check-useless-excludes`, declare no `stages:` and so run at every stage including this one.
 - `apm-audit-ci` runs `apm audit --ci` once per manifest — the root one and each of the six plugin packages — because the root-only invocation audits the marketplace manifest and **nothing else**, and `apm-pack-check-clean` does not parse plugin `dependencies:` blocks either (verified: a malformed one passes `apm pack --check-versions --check-clean --dry-run` and fails `apm audit --ci` in that package's directory). It verifies two things and claims no more: each `apm.yml` parses as a valid APM manifest, and any package declaring dependencies has a consistent `apm.lock.yaml`. It does **not** enforce an org policy — apm discovers one from the git remote and only understands github.com and Azure DevOps, so against this repo's self-hosted Gitea remote it prints `No org policy found at unknown; enforcement skipped`. Do **not** "fix" that with `policy.fetch_failure_default: block` in `apm.yml`: it was tested and rejected, because with no reachable policy source it makes the hook exit 1 on every push forever.
-- `check-apm-agents-valid` derives its expected agent-file set from `git ls-files` (same pattern as `tests/run-bats.sh`), so an agent file deleted from the worktree but still tracked fails the run, and discovering zero agent files is an error rather than a pass. An untracked new agent file is still validated — the derivation is one-directional on purpose, so uncommitted work is not blocked but also cannot bypass the gate.
+- `check-apm-agents-valid` derives its expected agent-file set from `git ls-files` (same pattern as `tests/run-bats.sh`), so an agent file deleted from the worktree but still tracked fails the run, and discovering zero agent files is an error rather than a pass. An untracked new agent file is still validated — the derivation is one-directional on purpose, so uncommitted work is not blocked but also cannot bypass the gate. Agents take the ADR-0020 description gates (`agent-audit`'s `validate.sh` holds its own copy of those two constants) and, deliberately, **no** body word gate: an agent body becomes the system prompt of a fresh context rather than competing with the caller's live conversation, so the 900-word FAIL does not transfer. A bats test pins that absence — adding a body gate there contradicts the ADR rather than fixing an inconsistency.
 - **Two** pre-push hooks need the network, for one shared reason: root `apm.yml`'s `marketplace.packages[]` contains exactly one remote entry (`mattpocock-skills`, `source: mattpocock/skills`), and resolving it needs a `git ls-remote`. `apm-marketplace-check` resolves every entry and is `always_run`, so it fails with `No cached refs (offline)`. `apm-pack-check-clean` (`apm pack --check-versions --check-clean --dry-run`) re-resolves the same entry and fails with `Error: Git network timeout during ls-remote`. Pinning the entry to an exact version does **not** remove the call — an exact pin still ls-remotes. `--offline` rescues neither. To push without a network, skip both using pre-commit's own mechanism: `SKIP=apm-marketplace-check,apm-pack-check-clean git push`. Skip those two alone — verified under `unshare -rn`, the other twelve pre-push hooks pass offline because they are real local checks (`check-executables-allow-sync` landed after that run, but reads two local manifests and makes no network call), and adding one of them to `SKIP` disarms it silently. `apm-audit-ci` calls `apm` too but stays local: its org-policy discovery resolves nothing on this remote before any network call, so it does not join the pair above.
 - Author commits with `git-commits` — it validates Conventional Commits (enforced at `commit-msg`) for you.