feat: add hooks functionality with automated workflows

- Introduced hooks to enable automated workflows triggered by specific events during GitHub Copilot sessions.
- Added documentation for hooks in AGENTS.md and README.md.
- Created a new directory structure for hooks, including README.md and hooks.json files.
- Implemented two example hooks: Session Auto-Commit and Session Logger.
- Developed scripts for logging session events and auto-committing changes.
- Enhanced validation and parsing for hook metadata.
- Updated build and validation scripts to accommodate new hooks functionality.

eng/collection-to-plugin.mjs

@@ -158,6 +158,8 @@ function getDisplayName(filePath, kind) {
     return basename.replace(".agent.md", "");
   } else if (kind === "instruction") {
     return basename.replace(".instructions.md", "");
+  } else if (kind === "hook") {
+    return basename.replace(".hook.md", "");
   } else if (kind === "skill") {
     return path.basename(filePath);
   }
@@ -221,6 +223,23 @@ function generateReadme(collection, items) {
     lines.push("");
   }
 
+  // Hooks
+  const hooks = items.filter((item) => item.kind === "hook");
+  if (hooks.length > 0) {
+    lines.push("### Hooks");
+    lines.push("");
+    lines.push("| Hook | Description | Event |");
+    lines.push("|------|-------------|-------|");
+    for (const item of hooks) {
+      const name = getDisplayName(item.path, "hook");
+      const description =
+        item.frontmatter?.description || item.frontmatter?.name || name;
+      const event = item.frontmatter?.event || "N/A";
+      lines.push(`| \`${name}\` | ${description} | ${event} |`);
+    }
+    lines.push("");
+  }
+
   // Skills
   const skills = items.filter((item) => item.kind === "skill");
   if (skills.length > 0) {