Major refactor: API, providers, messaging, and Anthropic protocol

Consolidates the incremental refactor work into a single change set: modular web tools (api/web_tools), native Anthropic request building and SSE block policy, OpenAI conversion and error handling, provider transports and rate limiting, messaging handler and tree queue, safe logging, smoke tests, and broad test coverage.

messaging/event_parser.py

@@ -9,12 +9,14 @@ from typing import Any
 from loguru import logger
 
 
-def parse_cli_event(event: Any) -> list[dict]:
+def parse_cli_event(event: Any, *, log_raw_cli: bool = False) -> list[dict]:
     """
     Parse a CLI event and return a structured result.
 
     Args:
         event: Raw event dictionary from CLI
+        log_raw_cli: When True, log full error text from the CLI. Default is
+            metadata-only (lengths / exit codes) to avoid leaking user content.
 
     Returns:
         List of parsed event dicts. Empty list if not recognized.
@@ -140,7 +142,11 @@ def parse_cli_event(event: Any) -> list[dict]:
     if etype == "error":
         err = event.get("error")
         msg = err.get("message") if isinstance(err, dict) else str(err)
-        logger.info(f"CLI_PARSER: Parsed error event: {msg}")
+        if log_raw_cli:
+            logger.info("CLI_PARSER: Parsed error event: {}", msg)
+        else:
+            mlen = len(msg) if isinstance(msg, str) else 0
+            logger.info("CLI_PARSER: Parsed error event: message_chars={}", mlen)
         return [{"type": "error", "message": msg}]
     elif etype == "exit":
         code = event.get("code", 0)
@@ -151,7 +157,19 @@ def parse_cli_event(event: Any) -> list[dict]:
         else:
             # Non-zero exit is an error
             error_msg = stderr if stderr else f"Process exited with code {code}"
-            logger.warning(f"CLI_PARSER: Error exit (code={code}): {error_msg}")
+            if log_raw_cli:
+                logger.warning(
+                    "CLI_PARSER: Error exit (code={}): {}",
+                    code,
+                    error_msg,
+                )
+            else:
+                em = error_msg if isinstance(error_msg, str) else str(error_msg)
+                logger.warning(
+                    "CLI_PARSER: Error exit (code={}): message_chars={}",
+                    code,
+                    len(em),
+                )
             return [
                 {"type": "error", "message": error_msg},
                 {"type": "complete", "status": "failed"},