feat: Update allowed commands

- Add "gh" to the allowed commands for the "start", "install", and "build" tasks
- This allows the script to use the GitHub CLI for fetching issue information
chore(main.ts): Add support for GitHub issue search and selection
- Add new function `searchAndSelectIssue` to search for and select a related issue
- Update `getCommitMessage` to include the selected issue information in the system prompt
- Add new function `getGitAuthor` to retrieve the git author information for the kernel format
- Improve formatting of the commit message display

deno.jsonc

@@ -1,8 +1,8 @@
 {
   "tasks": {
-    "start": "deno run --allow-net --allow-read --allow-write --allow-env --allow-run=\"git,vim\" main.ts",
-    "install": "deno run --allow-read --allow-write --allow-run scripts/install.ts",
-    "build": "deno run --allow-read --allow-write --allow-run scripts/build.ts",
+    "start": "deno run --allow-net --allow-read --allow-write --allow-env --allow-run=\"git,vim,gh\" main.ts",
+    "install": "deno run --allow-read --allow-write --allow-run=\"git,vim,gh\" scripts/install.ts",
+    "build": "deno run --allow-read --allow-write --allow-run=\"git,vim,gh\" scripts/build.ts",
     "update": "git pull && deno task install"
   },
   "name": "auto-commit",