refactor: wave 1 - extract leaf modules, rename catch-all files, split index.ts hooks

- Split 25+ index.ts files into hook.ts + extracted modules
- Rename all catch-all utils.ts/helpers.ts to domain-specific names
- Split src/tools/lsp/ into ~15 focused modules
- Split src/tools/delegate-task/ into ~18 focused modules
- Separate shared types from implementation
- 155 files changed, 60+ new files created
- All typecheck clean, 61 tests pass

src/agents/env-context.ts

@@ -0,0 +1,33 @@
+/**
+ * Creates OmO-specific environment context (time, timezone, locale).
+ * Note: Working directory, platform, and date are already provided by OpenCode's system.ts,
+ * so we only include fields that OpenCode doesn't provide to avoid duplication.
+ * See: https://github.com/code-yeongyu/oh-my-opencode/issues/379
+ */
+export function createEnvContext(): string {
+  const now = new Date()
+  const timezone = Intl.DateTimeFormat().resolvedOptions().timeZone
+  const locale = Intl.DateTimeFormat().resolvedOptions().locale
+
+  const dateStr = now.toLocaleDateString(locale, {
+    weekday: "short",
+    year: "numeric",
+    month: "short",
+    day: "numeric",
+  })
+
+  const timeStr = now.toLocaleTimeString(locale, {
+    hour: "2-digit",
+    minute: "2-digit",
+    second: "2-digit",
+    hour12: true,
+  })
+
+  return `
+<omo-env>
+  Current date: ${dateStr}
+  Current time: ${timeStr}
+  Timezone: ${timezone}
+  Locale: ${locale}
+</omo-env>`
+}