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/git/.apm/skills/git-worktrees/references/README.md

@@ -0,0 +1,13 @@
+---
+source_keys:
+  - git-scm-worktree-docs
+---
+
+# References
+
+This directory contains provenance metadata and research sources for the `git-worktrees` skill.
+
+## Files
+
+- `sources.md` — Extracted research sources and their contributing documents
+- `worktrees.md` — Full `add` flag table, sparse-checkout setup, removable-media locking, remote-branch disambiguation, and the config key reference

plugins/git/.apm/skills/git-worktrees/references/sources.md

@@ -0,0 +1,16 @@
+---
+# Research sources referenced by this skill
+# Each entry documents where the skill's guidance came from.
+---
+
+## git-scm-worktree-docs
+
+**Description:** Git SCM official documentation for `git worktree` command — creating, listing, locking, moving, removing, pruning, and repairing linked worktrees; shared vs. per-worktree state; worktree-scoped config.
+
+**Source:** https://git-scm.com/docs/git-worktree
+
+- **Research doc:** plugins/git/docs/research/docs/git/worktrees.md (whole-document reference — covers `## Concept Overview`, `## Key Commands`, `## Workflow Patterns`, `## Common Gotchas`, `## Configuration`)
+
+**Contributing files:**
+- SKILL.md (Concept, Gotchas, Common Operations, Worked Examples, Return Format)
+- references/worktrees.md (full `add` flag table, sparse-checkout, removable media, remote disambiguation, configuration)

plugins/git/.apm/skills/git-worktrees/references/worktrees.md

@@ -0,0 +1,63 @@
+---
+topic: worktrees
+source_keys:
+  - git-scm-worktree-docs
+---
+
+## Full `add` flag table
+
+| Flag | Meaning |
+|---|---|
+| `-b <branch>` | Create and check out a new branch; fails if it exists |
+| `-B <branch>` | Like `-b` but resets the branch if it already exists |
+| `-d` / `--detach` | Detach HEAD; useful for throwaway experiments |
+| `--orphan` | Create empty unborn branch |
+| `--no-checkout` | Suppress initial checkout (for sparse-checkout setup) |
+| `--guess-remote` | Look for a matching remote-tracking branch by path basename |
+| `--lock [--reason <str>]` | Lock immediately on creation (atomic; avoids race vs. add-then-lock) |
+| `-f` / `--force` | Allow when branch is already checked out elsewhere |
+| `--relative-paths` | Link via relative paths (portable across moves) |
+
+Using `-` as `<commit-ish>` is shorthand for `@{-1}` (the branch checked out before the current one), e.g. `git worktree add <path> -`.
+
+## New unborn branch
+
+```bash
+git worktree add --orphan -b <branch> <path>
+```
+Creates an empty branch with no commits.
+
+## Sparse-checkout worktree
+
+Suppress the initial checkout to configure sparse-checkout first:
+```bash
+git worktree add --no-checkout ../sparse main
+cd ../sparse
+git sparse-checkout init --cone
+git sparse-checkout set src/
+git checkout main
+```
+
+## Worktree on removable media
+
+```bash
+git worktree add --lock --reason "external SSD" <path> <branch>
+git worktree unlock <path>  # when reconnected
+```
+
+## Remote-branch disambiguation
+
+```bash
+git worktree add <path> <remote>/<branch>
+```
+For ambiguous names across remotes, `checkout.defaultRemote` config disambiguates explicitly, or `--guess-remote` auto-matches by path basename (default controlled by `worktree.guessRemote` config). If a branch name matches multiple remotes during `worktree add` and neither is set, Git refuses rather than guessing.
+
+## Configuration
+
+| Key | Effect |
+|---|---|
+| `worktree.guessRemote` | Default for `--guess-remote` on `git worktree add` |
+| `worktree.useRelativePaths` | Default for `--relative-paths` on `git worktree add` (link via relative paths — portable across moves) |
+| `gc.worktreePruneExpire` | How long before stale worktree metadata is pruned by `git gc` |
+| `extensions.worktreeConfig` | Enable per-worktree config scope (`config.worktree` file) — see Gotchas in SKILL.md |
+| `checkout.defaultRemote` | Disambiguates which remote to use when a branch name matches multiple remotes during `worktree add` |