✨ feat(workflow): adopt Matt Pocock ticket workflow

Replace the Superpowers plan pipeline with grill-with-docs, specs, local tickets, and ticket-native execution.

BREAKING CHANGE: Remove the legacy Plan CLI, prompt templates, and Superpowers skills.

.gitea/ci/thirdparty_skills.json

@@ -1,14 +1,48 @@
 {
   "sources": [
     {
-      "id": "superpowers",
-      "upstream_repo": "https://github.com/obra/superpowers.git",
+      "id": "matt-pocock-skills",
+      "upstream_repo": "https://github.com/mattpocock/skills.git",
       "upstream_ref": "main",
-      "snapshot_dir": "superpowers",
+      "snapshot_dir": "matt-pocock-skills",
       "sync_mode": "copy_skill_dirs",
-      "source_list": "skills/thirdparty/.sources/superpowers.list",
-      "skills_subdir": "skills",
-      "remove_paths": ["skills/ui-ux-pro-max"]
+      "source_list": "skills/thirdparty/.sources/matt-pocock-skills.list",
+      "skills_subdirs": [
+        "skills/engineering",
+        "skills/productivity",
+        "skills/misc"
+      ],
+      "include_skill_dirs": [
+        "ask-matt",
+        "code-review",
+        "codebase-design",
+        "diagnosing-bugs",
+        "domain-modeling",
+        "git-guardrails-claude-code",
+        "grill-me",
+        "grill-with-docs",
+        "grilling",
+        "handoff",
+        "implement",
+        "improve-codebase-architecture",
+        "migrate-to-shoehorn",
+        "prototype",
+        "research",
+        "resolving-merge-conflicts",
+        "scaffold-exercises",
+        "setup-matt-pocock-skills",
+        "setup-pre-commit",
+        "tdd",
+        "teach",
+        "to-questionnaire",
+        "to-spec",
+        "to-tickets",
+        "triage",
+        "wait-what",
+        "wayfinder",
+        "wizard",
+        "writing-for-agents"
+      ]
     },
     {
       "id": "ui-ux-pro-max",