#13168: perf: short-circuit --version to skip process respawn and full module loading

## Summary - Short-circuit `--version` (`-v`, `-V`) in `src/entry.ts` before the expensive `ensureExperimentalWarningSuppressed()` respawn and full Commander module loading ## Problem Running `openclaw --version` takes ~5s on a single-core VPS (1-2s on modern machines) to print a hardcoded version string. The entire startup pipeline runs unnecessarily: 1. `entry.ts` respawns the process with `--disable-warning=ExperimentalWarning` (~1.6s) 2. `run-main.ts` loads `program.js` which triggers `buildProgram()` — loading 87+ imports, 348 files, ~28MB of dist code (~3.3s) 3. `help.ts` finally catches `--version` and prints the version ## Fix Added a 6-line early exit in `src/entry.ts` that checks for version flags *before* the process respawn. Uses a dynamic `import("./version.js")` which is lightweight (just reads `package.json` via `createRequire`). **Before:** `openclaw --version` takes ~5s **After:** `openclaw --version` takes <100ms ## Files Changed - `src/entry.ts` — Added early exit for version flags before `ensureExperimentalWarningSuppressed()` ## Test plan - [x] TypeScript compiles cleanly (no new errors) - [x] Lint passes - [x] Existing tests pass — the version check in `help.ts` remains as a harmless fallback - [x] Behavior is identical: both paths use the same `VERSION` constant from `src/version.ts` Closes #13133 🤖 Generated with [Claude Code](https://claude.com/claude-code) <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> This PR adds an early `--version`/`-v`/`-V` check in `src/entry.ts` so the CLI can print the version and exit before triggering the expensive experimental-warning respawn logic and before importing the main Commander/program modules. The intention is to make `openclaw --version` fast by only dynamically importing `src/version` instead of running the full startup pipeline. <h3>Confidence Score: 3/5</h3> - This PR is mergeable after confirming module format/top-level await compatibility for the distributed entrypoint. - Change is small and targeted, but introducing top-level await in the CLI entrypoint can hard-break execution if the built entrypoint is ever CommonJS (or otherwise not TLA-capable) in any supported runtime/distribution path. That compatibility should be verified or avoided by rewriting without TLA. - src/entry.ts <!-- greptile_other_comments_section --> <!-- /greptile_comment -->