refactor: replace console.log/warn/error with file-based log() for silent logging

Replace all console output with shared logger to write to
/tmp/oh-my-opencode.log instead of stdout/stderr.

Files changed:
- index.ts: console.warn → log()
- hook-message-injector/injector.ts: console.warn → log()
- lsp/client.ts: console.error → log()
- ast-grep/downloader.ts: console.log/error → log()
- session-recovery/index.ts: console.error → log()
- comment-checker/downloader.ts: console.log/error → log()

CLI tools (install.ts, doctor, etc.) retain console output for UX.

src/hooks/session-recovery/index.ts

@@ -16,6 +16,7 @@ import {
   stripThinkingParts,
 } from "./storage"
 import type { MessageData, ResumeConfig } from "./types"
+import { log } from "../../shared/logger"
 
 export interface SessionRecoveryOptions {
   experimental?: ExperimentalConfig
@@ -414,7 +415,7 @@ export function createSessionRecoveryHook(ctx: PluginInput, options?: SessionRec
 
       return success
   } catch (err) {
-    console.error("[session-recovery] Recovery failed:", err)
+    log("[session-recovery] Recovery failed:", err)
     return false
   } finally {
     processingErrors.delete(assistantMsgID)