feat(kyberforge): execute plugin-to-apm marketplace conversion

Why:
ADR-0015 established that Microsoft APM (apm.yml + .apm/) should replace
this repo's hand-authored plugin.json/marketplace.json model, with those
files becoming compiled output of `apm pack` instead of files edited by
hand via the (now-retired) plugin-author/marketplace-author skills.
Issue #90 was the deferred execution of that decision, gated on #88
(apm tooling) and #89 (apm-native agent-author/skill-author routing).

Implementation notes:
- All six plugins (bin, core, git, gitea, kyberforge, lint) now carry
  apm.yml + .apm/{skills,agents,hooks} as their authoring source. Skills
  moved with a plain git mv (content-identical across targets). Agents
  were re-authored, not moved: per ADR-0016, .apm/agents/*.agent.md
  compiles verbatim to both Claude and Copilot, so plugin-scope agents
  now carry only name/description/model/source_keys -- no tools: field,
  no Claude-only knobs (isolation, maxTurns, effort, memory,
  permissionMode).
- Root apm.yml registers all 7 marketplace packages (6 local plus
  mattpocock-skills as a remote entry) under versioning: per_package,
  matching this repo's existing independent-plugin-versioning practice.
- .claude-plugin/marketplace.json and every plugin's plugin.json are now
  apm-pack-compiled output, verified against the prior hand-maintained
  content: same names/descriptions/versions/licenses/authors, only
  cosmetic serialization differences (JSON key order, owner email vs.
  url, Unicode escaping).
- plugin-author and marketplace-author are retired now that apm-based
  authoring fully replaces their job; kyberforge bumped 1.3.1 -> 1.4.0
  for that removal, and the root marketplace catalog bumped
  0.3.1 -> 0.3.2 to match, per the version-bump convention now
  documented in apm-workflow's reference docs instead of a dedicated
  script (apm has no native version-bump automation).
- Fixed hardcoded pre-.apm/ path assumptions across
  .pre-commit-config.yaml, .pre-commit-hooks.yaml,
  scripts/check-scope-walkup-sync.sh, scripts/sync-vale-styles.sh,
  scripts/check-vale-style-sync.sh, six plugins' root plugin.json
  (stale skills/hooks/agents pointer fields that check-manifests.sh
  validates), and several tests/*.bats and tests/*.sh fixtures --
  including a bats REPO_ROOT relative-path depth bug (10 files, one
  extra .apm/ directory level to walk up) and a vale probe-path
  isolation regression introduced mid-fix.
- Corrected empirically-wrong assumptions surfaced this session in
  apm-workflow/apm-install's own reference docs: `apm marketplace
  package add` does not accept local paths (only owner/repo remote
  shorthand -- local packages are registered by editing apm.yml's
  marketplace.packages[] directly); `apm compile` is a consumer-side
  AGENTS.md/CLAUDE.md generator, not the plugin.json producer, and
  hard-fails on skill/agent-only packages without --clean; `apm plugin
  init <name>` nests a stray subdirectory when run with a positional
  name arg from inside a same-named directory; no native Copilot
  marketplace output profile exists; .mcp.json is merged into the
  compiled plugin.json content-aware and target-scoped, with no
  dependencies.mcp entry needed for simple passthrough; pipx is the
  correct pip fallback on externally-managed Python environments.
- Renamed agent-author's copilot.agent.md template asset to
  copilot.agent.md.template so apm compile's recursive *.agent.md glob
  stops misparsing the placeholder template as a real agent primitive.

Impact:
plugin.json and marketplace.json are compiled artifacts from here on --
editing them by hand is no longer the workflow; edit apm.yml/.apm/ and
run apm pack. CONTEXT.md's Plugin/Plugin marketplace glossary entries
reflect this. ADR-0001 is marked superseded, ADR-0006 moot, and
ADR-0010 updated for the new .apm/agents/ path (project/user scope
unaffected, per ADR-0016). Full local verification: claude plugin
validate --strict on all 6 plugins, apm audit --ci, apm marketplace
check, check-manifests.sh, and the full test suite (165/165 bats,
13/13 shell scripts) all pass clean.

Fixes: #90
Refs: #88, #89
ADR: 0015
ADR: 0016

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ub96PyaSRD9BHPktotj1pC

plugins/core/skills/provider-adapter-author/SKILL.md

@@ -1,54 +0,0 @@
----
-name: provider-adapter-author
-description: >
-  Use when the user wants to convert a provider-specific AI instruction file
-  (CLAUDE.md, .cursor/rules/*.mdc, copilot-instructions.md, etc.) into a
-  thin adapter that defers to a repo's AGENTS.md — e.g. "reduce duplication
-  between CLAUDE.md and AGENTS.md", "make CLAUDE.md just import AGENTS.md"
-  — even if the pattern isn't named explicitly. Also invoke when
-  agentsmd-author detects an existing provider file overlapping with
-  AGENTS.md it just wrote. Detects redundant content in a provider file
-  relative to AGENTS.md and rewrites it down to a minimal reference (an
-  `@AGENTS.md`-style import where supported, or a text pointer otherwise)
-  plus genuinely provider-specific additions. Self-validates via a bundled
-  deterministic script before finishing. Do not use to write or audit
-  AGENTS.md itself — use agentsmd-author or agentsmd-audit.
-allowed-tools: Bash Read Edit Write
-metadata:
-  category: docs
-  source_keys:
-    - adr-0002-0003-two-tier-claude-md
-  version: "0.1.0"
----
-
-## Gotchas
-
-- Not every provider supports cross-file imports. Claude Code does — a `CLAUDE.md` can consist of nothing but one or more `@path` lines (e.g. `@AGENTS.md`), with no other content required. Cursor's `.cursor/rules/*.mdc` and GitHub Copilot's `copilot-instructions.md` have no native import mechanism as of current tooling — for those, "thin" means a short text pointer to AGENTS.md plus only what that tool actually needs, not a literal import line. Pass `--no-import-syntax` to `scripts/validate-adapter.sh` for these providers.
-- This skill never creates or edits `AGENTS.md` itself. If the target repo has no `AGENTS.md` yet, stop and point the user to `agentsmd-author` first — there's nothing to adapt to.
-- Only strip content from the provider file that's genuinely redundant with AGENTS.md. Provider-specific material (IDE settings, tool-only syntax, model-specific instructions) stays — the goal is thin, not empty.
-- Works standalone or composed-into by `agentsmd-author` — behave identically either way; don't assume a caller skill exists.
-
-## Step 1 — Detect
-
-Look for known provider instruction files in the target repo: `CLAUDE.md` (repo root, and any deployed copies), `.cursor/rules/*.mdc`, `.github/copilot-instructions.md`, and similar tool-specific files. Confirm `AGENTS.md` exists at the repo root — if not, stop and tell the user to run `agentsmd-author` first.
-
-## Step 2 — Diff and rewrite
-
-Read the provider file and `AGENTS.md` side by side. Separate the provider file's content into two buckets: lines that restate what `AGENTS.md` already owns (universal rules, conventions, project overview) versus lines that are genuinely provider-specific (tool syntax, IDE behavior, model-specific instructions). Rewrite the provider file:
-
-- **Providers with import syntax** (Claude Code): replace the redundant bucket with an `@AGENTS.md` (or correct relative path) import line, keep the provider-specific bucket below it.
-- **Providers without import syntax** (Cursor, Copilot, etc.): replace the redundant bucket with a short pointer sentence mentioning `AGENTS.md`, keep the provider-specific bucket.
-
-## Step 3 — Self-validate
-
-Run the bundled check before finishing — this is the skill's own closeout gate; there is no separate paired audit skill for this concern:
-
-```bash
-bash scripts/validate-adapter.sh [--no-import-syntax] [--max-lines N] <adapter-file> <agents-md-file>
-```
-
-Fix any `FAIL` and re-run until it exits `0`.
-
-## Step 4 — Report
-
-State which file was converted, what was removed versus kept, and the validator's final result.