refactor: migrate from Bun.Glob to npm glob package

Replace Bun.Glob usage with a new Glob utility wrapper around the npm 'glob' package.
This moves us off Bun-specific APIs toward standard Node.js compatible solutions.

Changes:
- Add new src/util/glob.ts utility module with scan(), scanSync(), and match()
- Default include option is 'file' (only returns files, not directories)
- Add symlink option (default: false) to control symlink following
- Migrate all 12 files using Bun.Glob to use the new Glob utility
- Add comprehensive tests for the glob utility

Breaking changes:
- Removed support for include: 'dir' option (use include: 'all' and filter manually)
- symlink now defaults to false (was true in most Bun.Glob usages)

Files migrated:
- src/util/log.ts
- src/util/filesystem.ts
- src/tool/truncation.ts
- src/session/instruction.ts
- src/storage/json-migration.ts
- src/storage/storage.ts
- src/project/project.ts
- src/cli/cmd/tui/context/theme.tsx
- src/config/config.ts
- src/tool/registry.ts
- src/skill/skill.ts
- src/file/ignore.ts

packages/opencode/src/util/log.ts

@@ -3,6 +3,7 @@ import fs from "fs/promises"
 import { createWriteStream } from "fs"
 import { Global } from "../global"
 import z from "zod"
+import { Glob } from "./glob"
 
 export namespace Log {
   export const Level = z.enum(["DEBUG", "INFO", "WARN", "ERROR"]).meta({ ref: "LogLevel", description: "Log level" })
@@ -77,13 +78,11 @@ export namespace Log {
   }
 
   async function cleanup(dir: string) {
-    const glob = new Bun.Glob("????-??-??T??????.log")
-    const files = await Array.fromAsync(
-      glob.scan({
-        cwd: dir,
-        absolute: true,
-      }),
-    )
+    const files = await Glob.scan("????-??-??T??????.log", {
+      cwd: dir,
+      absolute: true,
+      include: "file",
+    })
     if (files.length <= 5) return
 
     const filesToDelete = files.slice(0, -10)