feat: add Agent Plugins 1.0 package (#2623)

## Summary

- Add an Agent Plugins 1.0 package at the repository root.
- Expose the existing stdio server through a version-pinned `mcp.json`.
- Keep the package version and MCP npm pin synchronized through
release-please.
- Use `npx --prefix ${PLUGIN_DATA}` to avoid resolving the repository's
unbuilt local npm package instead of the published server. This keeps
compatibility with clients that cannot represent an explicit working
directory.
- Document installation through Agent Plugins CLI.

## Verification

- `plugin.json` and `mcp.json` pass the Agent Plugins 1.0 schemas.
- Exact head `02372c4d47ad257773b2b80c7d7fd056d7067be0` was tested using
local package bytes with the released Agent Plugins CLI 0.1.24.
- Isolated add, doctor, repair, and remove with data cleanup passed for
Claude Code, Gemini CLI, OpenCode, Cline, and Windsurf.
Configuration-only clients are not claimed as live model tests.
- OpenCode 1.18.25 with its built-in `opencode/big-pickle` model
successfully called `new_page` and `take_snapshot`, recovering a random
marker from a loopback test page. The marker was absent from the prompt,
and other tools were denied.
- Gemini CLI 0.57.0 reported the MCP server as connected. Its model call
was blocked by Google account eligibility, so Gemini model runtime is
not claimed.
- Package tree:
`sha256:50145f0cfd0e4095cfb00fc74755c0c930dc8258952c868de5dc81b54765c1a0`.
- Manifest:
`sha256:b34a4dcd71cd536a7f5a3a51d76d53ae5af3d0ce0f18783e71c7f01da865b867`.
- Sanitized runtime evidence:
https://github.com/777genius/universal-agent-plugins/blob/a022a505df4e9b6627d911d935c5fff511451ecd/tests/e2e/results/chrome-devtools-live-clients-2026-08-31.json

The earlier exact-head lifecycle evidence, including real Claude CLI
plugin discovery, remains available at
https://github.com/777genius/universal-agent-plugins/blob/main/tests/e2e/results/agentplugins-chrome-devtools-multiclient-2026-08-30.json.
It applies to the previously recorded head, not a new runtime claim for
this revision.

No real user project or browser profile was used. The community
directory short alias is being expanded separately; the README keeps the
direct repository command until that publication is available.

mcp.json

@@ -0,0 +1,10 @@
+{
+  "$schema": "https://agent-plugins.org/schemas/1.0.0/mcp.schema.json",
+  "mcpServers": {
+    "chrome-devtools": {
+      "type": "stdio",
+      "command": "npx",
+      "args": ["--prefix", "${PLUGIN_DATA}", "chrome-devtools-mcp@1.8.0"]
+    }
+  }
+}

plugin.json

@@ -0,0 +1,14 @@
+{
+  "$schema": "https://agent-plugins.org/schemas/1.0.0/plugin.schema.json",
+  "name": "chrome-devtools",
+  "version": "1.8.0",
+  "description": "Reliable Chrome automation, debugging, and performance analysis for AI agents.",
+  "author": {
+    "name": "Google Chrome",
+    "url": "https://developer.chrome.com/"
+  },
+  "homepage": "https://developer.chrome.com/docs/devtools/agents",
+  "repository": "https://github.com/ChromeDevTools/chrome-devtools-mcp",
+  "license": "Apache-2.0",
+  "keywords": ["browser", "chrome", "debugging", "mcp", "performance"]
+}

release-please-config.json

@@ -74,6 +74,16 @@
           "type": "json",
           "path": ".github/plugin/plugin.json",
           "jsonpath": "mcpServers['chrome-devtools'].args[0]"
+        },
+        {
+          "type": "json",
+          "path": "plugin.json",
+          "jsonpath": "version"
+        },
+        {
+          "type": "json",
+          "path": "mcp.json",
+          "jsonpath": "mcpServers['chrome-devtools'].args[2]"
         }
       ]
     }