- Replaced the unbounded native fetch (no total cap; no per-file cap for
open-ended ranges) adopted from PR #4903 with finite budgets: per-file
fetch covers bounded ranges up to endLine and open-ended ranges up to
startLine-1 plus the kept window, clamped to the native file-size
ceiling; the global ceiling scales by the same amplification.
- Threaded the scaled ceiling through mergeGrepResults so mixed
native+virtual ranged searches are not re-truncated pre-filter.
- Dropped the unrelated workflow-notice.md ellipsis churn from the PR.
- Added open-ended directory selector coverage.
Fixes#4898