feat: add native Qoder plugin support

.qoder-plugin/README.md

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+# ECC for Qoder
+
+This directory contains ECC's native Qoder plugin manifest. The repository root
+is the plugin bundle: Qoder loads the canonical `skills/`, `agents/`, and
+`commands/` directories rather than copies maintained under `.qoder-plugin/`.
+
+## Install and verify
+
+ECC's hook runtime requires Node.js 18 or newer on Qoder's non-interactive
+`PATH`. From a reviewed checkout:
+
+```bash
+qoder plugins validate . --strict
+qoder plugins install .
+qoder plugins list
+```
+
+For Qoder IDE, create a ZIP whose root contains `.qoder-plugin/`, `skills/`,
+`agents/`, `commands/`, `hooks/`, `scripts/`, and `.mcp.json`, then use
+**Upload Plugin**. Do not upload only `.qoder-plugin/` or an individual
+`SKILL.md`; both would omit referenced resources.
+
+## Capability boundary
+
+- Qoder discovers all compatible skills and agents from their canonical root
+  directories. `commands/` remains a legacy compatibility surface; workflows
+  should prefer their corresponding skills.
+- The bundled `chrome-devtools` MCP server uses the same pinned `npx` launch
+  contract as Codex. It is downloaded on first use and therefore requires Node,
+  npm/npx, and network access.
+- Qoder receives only ECC's reviewed `SessionStart` bootstrap. The much broader
+  Claude hook profile is not copied: blocking tool hooks, asynchronous stop
+  jobs, and Claude-specific matchers have not been asserted to be Qoder-safe.
+- The Qoder hook uses `command` plus `args`, `QODER_PLUGIN_ROOT`, and Node's own
+  executable for child processes. It does not rely on Bash, `python3`, or shell
+  variable expansion, so the launcher contract is portable across native
+  Windows, macOS, and Linux when Node 18+ is available.
+
+Qoder plugin installation is separate from ECC's managed installer. Do not
+combine it with a manually copied Qoder skill installation.

.qoder-plugin/plugin.json

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+{
+  "name": "ecc",
+  "displayName": "ECC",
+  "version": "2.2.3",
+  "description": "Harness-native engineering workflows for Qoder: 302 skills, 71 agents, legacy command shims, a reviewed SessionStart hook, and optional MCP tooling.",
+  "author": {
+    "name": "Affaan Mustafa",
+    "url": "https://x.com/affaanmustafa"
+  },
+  "homepage": "https://ecc.tools",
+  "repository": "https://github.com/affaan-m/ECC",
+  "license": "MIT",
+  "keywords": [
+    "qoder",
+    "agents",
+    "skills",
+    "tdd",
+    "code-review",
+    "security",
+    "workflow",
+    "automation"
+  ],
+  "skills": "./skills/",
+  "commands": "./commands/",
+  "mcpServers": "./.mcp.json",
+  "hooks": "./hooks/qoder-hooks.json"
+}