feat: implement hooks for copilot

README.md

@@ -70,7 +70,7 @@ See [Quick Start guide](https://dyoshikawa.github.io/rulesync/getting-started/qu
 | Codex CLI          | codexcli     | ✅ 🌏 |        | ✅ 🌏 🔧 |    🌏    |    ✅     | ✅ 🌏  |       |
 | Gemini CLI         | geminicli    | ✅ 🌏 |   ✅   |  ✅ 🌏   |  ✅ 🌏   |    🎮     | ✅ 🌏  |       |
 | Goose              | goose        | ✅ 🌏 |        |          |          |           |        |       |
-| GitHub Copilot     | copilot      | ✅ 🌏 |        |    ✅    |    ✅    |    ✅     |   ✅   |       |
+| GitHub Copilot     | copilot      | ✅ 🌏 |        |    ✅    |    ✅    |    ✅     |   ✅   |  ✅   |
 | Cursor             | cursor       |  ✅   |   ✅   |    ✅    |  ✅ 🌏   |   ✅ 🌏   | ✅ 🌏  |  ✅   |
 | Factory Droid      | factorydroid | ✅ 🌏 |        |  ✅ 🌏   |  ✅ 🌏   |   ✅ 🌏   | ✅ 🌏  |       |
 | OpenCode           | opencode     | ✅ 🌏 |        |  ✅ 🔧   |  ✅ 🌏   |   ✅ 🌏   | ✅ 🌏  | ✅ 🌏 |

docs/reference/file-formats.md

@@ -43,9 +43,12 @@ Hooks run scripts at lifecycle events (e.g. session start, before tool use). Eve
 - **Cursor:** `sessionStart`, `preToolUse`, `postToolUse`, `stop`, `sessionEnd`, `beforeSubmitPrompt`, `subagentStop`, `preCompact`, `afterFileEdit`, `afterShellExecution`, `postToolUseFailure`, `subagentStart`, `beforeShellExecution`, `beforeMCPExecution`, `afterMCPExecution`, `beforeReadFile`, `afterAgentResponse`, `afterAgentThought`, `beforeTabFileRead`, `afterTabFileEdit`
 - **Claude Code:** `sessionStart`, `preToolUse`, `postToolUse`, `stop`, `sessionEnd`, `beforeSubmitPrompt`, `subagentStop`, `preCompact`, `permissionRequest`, `notification`, `setup`
 - **OpenCode:** `sessionStart`, `preToolUse`, `postToolUse`, `stop`, `afterFileEdit`, `afterShellExecution`, `permissionRequest`
+- **GitHub Copilot:** `sessionStart`, `sessionEnd`, `afterSubmitPrompt`, `preToolUse`, `postToolUse`, `afterError`
 
 > **Note:** Rulesync implements OpenCode hooks as a plugin, so importing from OpenCode to rulesync is not supported. OpenCode only supports command-type hooks (not prompt-type).
 
+> **Note:** GitHub Copilot's format uses separate `powershell` and `bash` fields for hooks. Rulesync supports only a single `command` field and resolves this by emitting the command under the `powershell` key on Windows, and under the `bash` key on all other platforms.
+
 Use optional **override keys** so tool-specific events and config live in one file without leaking to others: `cursor.hooks` for Cursor-only events, `claudecode.hooks` for Claude-only, `opencode.hooks` for OpenCode-only. Events in shared `hooks` that a tool does not support are skipped for that tool (and a warning is logged at generate time).
 
 Example:

docs/reference/supported-tools.md

@@ -9,7 +9,7 @@ Rulesync supports both **generation** and **import** for All of the major AI cod
 | Claude Code        | claudecode   | ✅ 🌏 |   ✅   |  ✅ 🌏   |  ✅ 🌏   |   ✅ 🌏   | ✅ 🌏  |  ✅   |
 | Codex CLI          | codexcli     | ✅ 🌏 |        | ✅ 🌏 🔧 |    🌏    |    ✅     | ✅ 🌏  |       |
 | Gemini CLI         | geminicli    | ✅ 🌏 |   ✅   |  ✅ 🌏   |  ✅ 🌏   |    🎮     | ✅ 🌏  |       |
-| GitHub Copilot     | copilot      | ✅ 🌏 |        |    ✅    |    ✅    |    ✅     |   ✅   |       |
+| GitHub Copilot     | copilot      | ✅ 🌏 |        |    ✅    |    ✅    |    ✅     |   ✅   |  ✅   |
 | Goose              | goose        | ✅ 🌏 |        |          |          |           |        |       |
 | Cursor             | cursor       |  ✅   |   ✅   |    ✅    |  ✅ 🌏   |   ✅ 🌏   | ✅ 🌏  |  ✅   |
 | Factory Droid      | factorydroid | ✅ 🌏 |        |  ✅ 🌏   |  ✅ 🌏   |   ✅ 🌏   | ✅ 🌏  |       |

skills/rulesync/file-formats.md

@@ -43,9 +43,12 @@ Hooks run scripts at lifecycle events (e.g. session start, before tool use). Eve
 - **Cursor:** `sessionStart`, `preToolUse`, `postToolUse`, `stop`, `sessionEnd`, `beforeSubmitPrompt`, `subagentStop`, `preCompact`, `afterFileEdit`, `afterShellExecution`, `postToolUseFailure`, `subagentStart`, `beforeShellExecution`, `beforeMCPExecution`, `afterMCPExecution`, `beforeReadFile`, `afterAgentResponse`, `afterAgentThought`, `beforeTabFileRead`, `afterTabFileEdit`
 - **Claude Code:** `sessionStart`, `preToolUse`, `postToolUse`, `stop`, `sessionEnd`, `beforeSubmitPrompt`, `subagentStop`, `preCompact`, `permissionRequest`, `notification`, `setup`
 - **OpenCode:** `sessionStart`, `preToolUse`, `postToolUse`, `stop`, `afterFileEdit`, `afterShellExecution`, `permissionRequest`
+- **GitHub Copilot:** `sessionStart`, `sessionEnd`, `afterSubmitPrompt`, `preToolUse`, `postToolUse`, `afterError`
 
 > **Note:** Rulesync implements OpenCode hooks as a plugin, so importing from OpenCode to rulesync is not supported. OpenCode only supports command-type hooks (not prompt-type).
 
+> **Note:** GitHub Copilot's format uses separate `powershell` and `bash` fields for hooks. Rulesync supports only a single `command` field and resolves this by emitting the command under the `powershell` key on Windows, and under the `bash` key on all other platforms.
+
 Use optional **override keys** so tool-specific events and config live in one file without leaking to others: `cursor.hooks` for Cursor-only events, `claudecode.hooks` for Claude-only, `opencode.hooks` for OpenCode-only. Events in shared `hooks` that a tool does not support are skipped for that tool (and a warning is logged at generate time).
 
 Example:

skills/rulesync/supported-tools.md

@@ -9,7 +9,7 @@ Rulesync supports both **generation** and **import** for All of the major AI cod
 | Claude Code        | claudecode   | ✅ 🌏 |   ✅   |  ✅ 🌏   |  ✅ 🌏   |   ✅ 🌏   | ✅ 🌏  |  ✅   |
 | Codex CLI          | codexcli     | ✅ 🌏 |        | ✅ 🌏 🔧 |    🌏    |    ✅     | ✅ 🌏  |       |
 | Gemini CLI         | geminicli    | ✅ 🌏 |   ✅   |  ✅ 🌏   |  ✅ 🌏   |    🎮     | ✅ 🌏  |       |
-| GitHub Copilot     | copilot      | ✅ 🌏 |        |    ✅    |    ✅    |    ✅     |   ✅   |       |
+| GitHub Copilot     | copilot      | ✅ 🌏 |        |    ✅    |    ✅    |    ✅     |   ✅   |  ✅   |
 | Goose              | goose        | ✅ 🌏 |        |          |          |           |        |       |
 | Cursor             | cursor       |  ✅   |   ✅   |    ✅    |  ✅ 🌏   |   ✅ 🌏   | ✅ 🌏  |  ✅   |
 | Factory Droid      | factorydroid | ✅ 🌏 |        |  ✅ 🌏   |  ✅ 🌏   |   ✅ 🌏   | ✅ 🌏  |       |