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/session/instruction.ts

@@ -6,6 +6,7 @@ import { Config } from "../config/config"
 import { Instance } from "../project/instance"
 import { Flag } from "@/flag/flag"
 import { Log } from "../util/log"
+import { Glob } from "../util/glob"
 import type { MessageV2 } from "./message-v2"
 
 const log = Log.create({ service: "instruction" })
@@ -98,13 +99,11 @@ export namespace InstructionPrompt {
           instruction = path.join(os.homedir(), instruction.slice(2))
         }
         const matches = path.isAbsolute(instruction)
-          ? await Array.fromAsync(
-              new Bun.Glob(path.basename(instruction)).scan({
-                cwd: path.dirname(instruction),
-                absolute: true,
-                onlyFiles: true,
-              }),
-            ).catch(() => [])
+          ? await Glob.scan(path.basename(instruction), {
+              cwd: path.dirname(instruction),
+              absolute: true,
+              include: "file",
+            }).catch(() => [])
           : await resolveRelative(instruction)
         matches.forEach((p) => {
           paths.add(path.resolve(p))