#12656: fix: install unhandled rejection handler before async boot operations

## Summary Fixes #12634 The installUnhandledRejectionHandler() was being called **after** several async operations like ryRouteCli(). If a network error occurred during early boot (before the handler was installed), it would cause an unhandled promise rejection that crashed the gateway. ## The Fix Move the error handlers to the very first lines of unCli() to ensure they catch any errors during the entire boot sequence. ### Before \\\ ypescript export async function runCli(argv: string[] = process.argv) { const normalizedArgv = stripWindowsNodeExec(argv); loadDotEnv({ quiet: true }); // ... more async work ... if (await tryRouteCli(normalizedArgv)) { // ← Network error here = crash! return; } // Handler installed too late installUnhandledRejectionHandler(); } \\\ ### After \\\ ypescript export async function runCli(argv: string[] = process.argv) { // Global error handlers FIRST installUnhandledRejectionHandler(); process.on('uncaughtException', ...); // Now safe to do async work const normalizedArgv = stripWindowsNodeExec(argv); // ... } \\\ ## Test Plan - [x] Verified the change is minimal and logically correct - [ ] CI will run full test suite 🤖 AI-assisted analysis and fix via Clawdbot <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> Moves installation of the global process error handlers (`unhandledRejection` via `installUnhandledRejectionHandler()` and `uncaughtException`) to the very start of `src/cli/run-main.ts:runCli`, before any async boot work (env setup, routing via `tryRouteCli`, and dynamic imports). This ensures early-boot failures (notably transient network errors during routing) are logged/handled consistently rather than surfacing as unhandled promise rejections that crash the process. <h3>Confidence Score: 4/5</h3> - This PR is close to safe to merge, with one process-level handler idempotency concern to address. - The change is small and improves early-boot error coverage, but it also makes `runCli()` install global process handlers earlier and unconditionally; without an idempotency guard, multiple invocations in the same process can accumulate listeners and duplicate exits/logs. - src/cli/run-main.ts <!-- greptile_other_comments_section --> _{(2/5) Greptile learns from your feedback when you react with thumbs up/down!} <!-- /greptile_comment -->