refactor(plugin): collapse three host bundles into one shared plugin/ tree

.gitattributes

@@ -4,11 +4,9 @@ tests/fixtures/** text eol=lf
 # Force LF for bundled plugin skill docs; the skill hygiene tests assert the
 # canonical source files are LF-only, and Windows checkout otherwise rewrites
 # them before the lint runs.
-codex-plugin/skills/** text eol=lf
-cursor-plugin/skills/** text eol=lf
-claude-plugin/** text eol=lf
+plugin/** text eol=lf
 # Force LF for the retained agent source of truth; the bundle byte-identity
-# test compares claude-plugin agents against these files and Windows checkout
+# test compares plugin agents against these files and Windows checkout
 # otherwise rewrites them to CRLF.
 src/agents/claude_agents/** text eol=lf
 # Force LF for embedded Hermes plugin template assets — they are pulled into

.github/workflows/plugin-validation.yml

@@ -12,8 +12,7 @@ name: Plugin Validation
 on:
   pull_request:
     paths:
-      - "cursor-plugin/**"
-      - "codex-plugin/**"
+      - "plugin/**"
       - "tests/fixtures/cursor-schemas/**"
       # Plugin/skill test modules (e.g. plugin_manifest_schema_test.rs,
       # plugin_skill_contract_test.rs, the skill lint tests).
@@ -65,15 +64,15 @@ jobs:
         run: |
           npx --no-install ajv validate --spec=draft7 -c ajv-formats --errors=text \
             -s tests/fixtures/cursor-schemas/plugin.schema.json \
-            -d cursor-plugin/.cursor-plugin/plugin.json
+            -d plugin/.cursor-plugin/plugin.json
 
       # The Codex manifest follows Codex's own layout (e.g. its `interface`
       # block), so the Cursor schema does not apply; keep it to a strict JSON
       # well-formedness check alongside the other bundle JSON files.
       - name: Check bundle JSON files parse
         run: |
           set -euo pipefail
-          find cursor-plugin codex-plugin -name '*.json' -print0 |
+          find plugin -name '*.json' -print0 |
             while IFS= read -r -d '' f; do
               python3 -c "import json,sys; json.load(open(sys.argv[1]))" "$f" \
                 || { echo "invalid JSON: $f" >&2; exit 1; }

.gitignore

@@ -3,8 +3,7 @@
 .codegraph
 .tracedecay
 .mcp.json
-!codex-plugin/.mcp.json
-!claude-plugin/.mcp.json
+!plugin/.mcp.json
 .claude/
 .cursor/
 docs/superpowers

Cargo.toml

@@ -25,8 +25,7 @@ include = [
     "/benches/**",
     "/examples/**",
     "/benchmarks/queries/default.toml",
-    "/cursor-plugin/**",
-    "/codex-plugin/**",
+    "/plugin/**",
     "/vendor/**",
     "/dashboard/shell/dist/**",
     "/dashboard/holographic/dist/**",