chore(apm): retire skill enumeration from published descriptions

Why: enumerating a plugin's skills in its published description has now failed
three times in four days, the third time inside the correction for the second.

bb9158d (Aug 14) fixed core's description, which described bin's skills. That
failure was wrong content, not an incomplete list -- a syntactically perfect
four-item enumeration that belonged to a different plugin -- so enumerating
harder could not have caught it, and bb9158d's own fix replaced the enumeration
with a domain boundary. 65bac15 and de84d1b then cited that precedent while
doing the opposite, and the re-enumeration is itself incomplete: caveman and
zoom-out are unnamed in bin, git-workflow is unnamed in git despite 65bac15's
message claiming it was added, and gitea-workflow is unnamed in gitea. 23 of 27
skills named at the third attempt.

Nothing checks any of this. check-manifests.sh does not contain the string
"description"; apm audit --ci, apm pack --check-clean and
sync-plugin-content.sh --check all compare compiled output against apm.yml, so
their job is to propagate whatever it says byte-for-byte. The wiki claim passed
all fourteen pre-push hooks every day it was published. Enumeration also makes a
marketplace release the consequence of a directory appearing.

Implementation notes:
- ADR-0021 records the decision, the three failures, and why no gate is added:
  the check is one-directional, cannot see an invented capability, and a
  correspondence map would relocate the same per-skill maintenance one file over.
- bin 1.1.4 -> 1.1.5, git 1.3.4 -> 1.3.5, gitea 1.3.5 -> 1.3.6,
  marketplace.version 0.4.4 -> 0.4.5, all PATCH under per_package.
- apm.yml's top-level version: is restored to lockstep at 0.4.5. It has moved
  with marketplace.version in all eleven commits that ever touched the file
  until this branch left it at 0.4.2, and apm.yml's own comment records it as
  live and consumed by apm audit.
- git's boundary names the pre-commit hooks explicitly: pc-author and pc-run are
  not git operations, and a boundary drawn narrower than the contents is the
  same defect one level up.
- Regenerated with apm pack for the marketplace manifests and
  sync-plugin-content.sh --all for the per-plugin ones; both mirrors verified
  byte-identical.

Impact: consumer-facing. 16/16 pre-push hooks pass, suite green, generated diff
is 26 insertions and 26 deletions across 8 files with no incidental churn.

Refs: #105
ADR: 0021

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TmFqzpuExLJv3m114XVE9w

apm.yml

@@ -1,5 +1,5 @@
 name: holocron
-version: 0.4.2
+version: 0.4.5
 description: AI development skills for Claude Code and GitHub Copilot CLI — factory, design, implement, review, and cross-cutting workflows.
 license: MIT
 
@@ -52,7 +52,7 @@ marketplace:
   # top-level apm.yml description:/version: above are NOT inherited into the
   # compiled output despite being used elsewhere (e.g. by `apm audit`).
   description: AI development skills for Claude Code and GitHub Copilot CLI — factory, design, implement, review, and cross-cutting workflows.
-  version: 0.4.4
+  version: 0.4.5
   owner:
     name: Defame1297
     email: defame1297@rkdr.net
@@ -83,21 +83,21 @@ marketplace:
       category: Developer Tools
 
     - name: bin
-      description: Cross-cutting workflow skills not yet split into a focused plugin — research, documentation, TDD, prototyping, triage, diagnosis, architecture review, and requirement grilling.
+      description: Skills for everyday AI-assisted development work that is not tied to a single tool, forge or language, and has not yet been split into a focused plugin.
       source: ./plugins/bin
-      version: 1.1.4
+      version: 1.1.5
       category: Utilities
 
     - name: git
-      description: Skills for working with Git — conventional commits, branches, history, submodules, worktrees, remotes, and pre-commit hook authoring and running.
+      description: Skills and agents for working with a local Git clone over the git wire protocol, and for authoring and running the pre-commit hooks that guard it.
       source: ./plugins/git
-      version: 1.3.4
+      version: 1.3.5
       category: Version Control
 
     - name: gitea
-      description: Skills for managing Gitea repositories — issues, pull requests, labels, milestones, releases, branches, and files.
+      description: Skills and agents for working with a Gitea forge through its HTTP API — the forge's own objects, as distinct from the local git clone.
       source: ./plugins/gitea
-      version: 1.3.5
+      version: 1.3.6
       category: Version Control
 
     - name: core