Remove noisy "Loaded agent instructions file" log from all adapters

Loading an instructions file is normal, expected behavior — not worth
logging to stdout/stderr on every run. Warning logs for failed reads
are preserved.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/adapters/opencode-local/src/server/execute.ts

@@ -221,10 +221,6 @@ export async function execute(ctx: AdapterExecutionContext): Promise<AdapterExec
         `${instructionsContents}\n\n` +
         `The above agent instructions were loaded from ${resolvedInstructionsFilePath}. ` +
         `Resolve any relative file references from ${instructionsDir}.\n\n`;
-      await onLog(
-        "stdout",
-        `[paperclip] Loaded agent instructions file: ${resolvedInstructionsFilePath}\n`,
-      );
     } catch (err) {
       const reason = err instanceof Error ? err.message : String(err);
       await onLog(