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feat(cli): add startup performance profiler (#3232)

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feat(cli): add startup performance profiler (#3219)

  Add a lightweight startup profiler activated via QWEN_CODE_PROFILE_STARTUP=1.
  When enabled, collects performance.now() timestamps at 7 key phases in main()
  and writes a JSON report to ~/.qwen/startup-perf/. Also records
  process.uptime() at T0 to capture module loading time not covered by
  checkpoint-based measurement.

  Key design decisions:
  - Only profiles inside sandbox child process to avoid duplicate reports
  - initStartupProfiler() is idempotent (resets state on each call)
  - Filename uses report.sessionId for consistency with JSON content
  - Zero overhead when disabled (single env var check)

  Initial measurement: module loading ~1342ms (94%), main() ~85ms (6%),
  confirming barrel exports and eager dependency loading as primary
  optimization targets for #3011.

  Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>
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docs/users/configuration/settings.md
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@ -527,6 +527,7 @@ For authentication-related variables (like `OPENAI_*`) and the recommended `.qwe
| `CODE_ASSIST_ENDPOINT` | Specifies the endpoint for the code assist server. | This is useful for development and testing. |
| `QWEN_CODE_MAX_OUTPUT_TOKENS` | Overrides the default maximum output tokens per response. When not set, Qwen Code uses an adaptive strategy: starts with 8K tokens and automatically retries with 64K if the response is truncated. Set this to a specific value (e.g., `16000`) to use a fixed limit instead. | Takes precedence over the capped default (8K) but is overridden by `samplingParams.max_tokens` in settings. Disables automatic escalation when set. Example: `export QWEN_CODE_MAX_OUTPUT_TOKENS=16000` |
| `TAVILY_API_KEY` | Your API key for the Tavily web search service. | Used to enable the `web_search` tool functionality. Example: `export TAVILY_API_KEY="tvly-your-api-key-here"` |
| `QWEN_CODE_PROFILE_STARTUP` | Set to `1` to enable startup performance profiling. Writes a JSON timing report to `~/.qwen/startup-perf/` with per-phase durations. | Only active inside the sandbox child process. Zero overhead when not set. Example: `export QWEN_CODE_PROFILE_STARTUP=1` |
## Command-Line Arguments