fix(kyberforge): force plugin.json regeneration on every real sync

apm pack silently skips regenerating plugin.json when it already exists
("already exists; skipping plugin.json generation. Re-run with --force to
overwrite it."). sync-plugin-content.sh never passed --force, so
.claude-plugin/plugin.json and .github/plugin/plugin.json were written
once on first sync and never refreshed again -- a name/version/description
edit in a plugin's apm.yml would silently stop propagating, with no gate
catching it (check-manifests.sh only checks presence; check-plugin-content-
sync explicitly excludes plugin.json; apm-pack-check-clean is scoped to
marketplace.json only).

Pass --force on real-mode syncs only (--check must not mutate the plugin
root, so plugin.json staleness there stays a known, undetected gap until
the next real sync -- documented in the script's header comment).

Regenerating surfaced a second, unrelated bug: apm's writer and
pretty-format-json's --autofix disagree on JSON key order (semantic vs.
alphabetical), so every real sync would otherwise flip plugin.json's key
order right back after a commit re-alphabetized it. Excluded the four
apm-generated manifests (plugin.json x2, marketplace.json x2) from
pretty-format-json -- their exact formatting is dictated by apm's own
writer as compiled output, not this repo's generic JSON prettifier.

Verified idempotent: a second real sync after this fix produces zero
further diff.

Refs: #90

plugins/gitea/.claude-plugin/plugin.json

@@ -1,10 +1,13 @@
 {
+  "name": "gitea",
+  "version": "1.3.3",
+  "description": "Skills for managing Gitea repositories \u2014 issues, pull requests, milestones, releases, and wikis.",
   "author": {
-    "email": "defame1297@rkdr.net",
     "name": "Defame1297",
+    "email": "defame1297@rkdr.net",
     "url": "https://git.dev.rkdr.net/Defame1297/"
   },
-  "description": "Skills for managing Gitea repositories \u2014 issues, pull requests, milestones, releases, and wikis.",
+  "license": "MIT",
   "keywords": [
     "gitea",
     "issues",
@@ -12,8 +15,5 @@
     "milestones",
     "releases",
     "branches"
-  ],
-  "license": "MIT",
-  "name": "gitea",
-  "version": "1.3.3"
+  ]
 }

plugins/gitea/.github/plugin/plugin.json

@@ -1,10 +1,13 @@
 {
+  "name": "gitea",
+  "version": "1.3.3",
+  "description": "Skills for managing Gitea repositories \u2014 issues, pull requests, milestones, releases, and wikis.",
   "author": {
-    "email": "defame1297@rkdr.net",
     "name": "Defame1297",
+    "email": "defame1297@rkdr.net",
     "url": "https://git.dev.rkdr.net/Defame1297/"
   },
-  "description": "Skills for managing Gitea repositories \u2014 issues, pull requests, milestones, releases, and wikis.",
+  "license": "MIT",
   "keywords": [
     "gitea",
     "issues",
@@ -12,8 +15,5 @@
     "milestones",
     "releases",
     "branches"
-  ],
-  "license": "MIT",
-  "name": "gitea",
-  "version": "1.3.3"
+  ]
 }