chore: add changeset for ENOBUFS fix

Author: prosdev

.changeset/fix-github-enobufs.md

@@ -0,0 +1,37 @@
+---
+"@lytics/dev-agent": patch
+"@lytics/dev-agent-subagents": patch
+"@lytics/dev-agent-cli": patch
+---
+
+Fix ENOBUFS error during GitHub issues/PRs indexing for large repositories
+
+**Problem:** When indexing repositories with many GitHub issues/PRs (especially with large issue bodies), the `dev index` command would fail with `ENOBUFS` (No buffer space available) error.
+
+**Solution:**
+- Increased execSync maxBuffer from default 1MB to 50MB for issue/PR fetching
+- Reduced default fetch limit from 1000 to 500 items to prevent buffer overflow
+- Added `--gh-limit` CLI flag to allow users to customize the limit
+- Improved error messages to guide users when buffer issues occur
+
+**Changes:**
+- `fetchIssues()` and `fetchPullRequests()` now use 50MB maxBuffer
+- Default limit changed from 1000 to 500 (per type: issues and PRs)
+- Added `--gh-limit <number>` flag to `dev index` command
+- Better error handling with helpful suggestions (use `--gh-limit 100` for very large repos)
+- Comprehensive test coverage (23 new tests for fetcher utilities)
+
+**Usage:**
+```bash
+# Default (works for most repos)
+dev index
+
+# For large repos (200+ issues/PRs)
+dev index --gh-limit 200
+
+# For very active repos (500+ issues/PRs)
+dev index --gh-limit 100
+```
+
+**Testing:** All 1100+ tests passing. Verified on lytics-ui repository (6989 files, 1000 issues/PRs indexed successfully).
+