#21509: fix: show requestedHost instead of configuredHost in exec host error hint

## Summary The error message for disallowed exec host showed the already-configured host in the `configure tools.exec.host=X to allow` hint, making the suggestion circular and confusing. **Before:** `exec host not allowed (requested gateway; configure tools.exec.host=sandbox to allow)` **After:** `exec host not allowed (requested gateway; configure tools.exec.host=gateway to allow)` One-line fix: `configuredHost` → `requestedHost` in the error string interpolation. Fixes #21501 <!-- greptile_comment --> <h3>Greptile Summary</h3> Fixed error message to show the host the user should configure instead of the already-configured host. When an exec host request is denied, the error previously told users to configure `tools.exec.host` to the value that was already set, creating a confusing circular suggestion. The fix correctly suggests configuring the requested host instead. - Corrected error hint in `src/agents/bash-tools.exec.ts:288` from `configuredHost` to `requestedHost` - Added `openclaw-*.log` to `.gitignore` (unrelated cleanup) <h3>Confidence Score: 5/5</h3> - This PR is safe to merge with no risk - Single-line fix that corrects a simple variable reference in an error message. The change is logically correct (verified against test expectations), has no side effects, and improves user experience by providing accurate configuration guidance - No files require special attention _{Last reviewed commit: f3a586a} <!-- greptile_other_comments_section --> _{(3/5) Reply to the agent's comments like "Can you suggest a fix for this @greptileai?" or ask follow-up questions!} <!-- /greptile_comment -->