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.

hooks/session-logger/hooks.json

@@ -0,0 +1,32 @@
+{
+  "version": 1,
+  "hooks": {
+    "sessionStart": [
+      {
+        "type": "command",
+        "bash": ".github/hooks/session-logger/log-session-start.sh",
+        "cwd": ".",
+        "timeoutSec": 5
+      }
+    ],
+    "sessionEnd": [
+      {
+        "type": "command",
+        "bash": ".github/hooks/session-logger/log-session-end.sh",
+        "cwd": ".",
+        "timeoutSec": 5
+      }
+    ],
+    "userPromptSubmitted": [
+      {
+        "type": "command",
+        "bash": ".github/hooks/session-logger/log-prompt.sh",
+        "cwd": ".",
+        "env": {
+          "LOG_LEVEL": "INFO"
+        },
+        "timeoutSec": 5
+      }
+    ]
+  }
+}