fix(dream-cli): _compose_run_with_summary polish (SIGINT cleanup + zero-grep-match hint)

[yasinBursali]

fix(dream-cli): _compose_run_with_summary polish (SIGINT cleanup + zero-grep-match hint)

Consolidated from: #405 + #407

Scope

Two polish changes to the same function body (_compose_run_with_summary at dream-server/dream-cli:513-553):

• dream-cli: trap mktemp cleanup in _compose_run_with_summary on SIGINT/SIGTERM #405 — Add trap 'rm -f "$_compose_log"' INT TERM inside the helper so mktemp cleanup survives Ctrl-C during compose operations. Restore trap with trap - INT TERM on normal exit (success and failure paths).
• dream-cli: surface zero-grep-match hint when compose fails with unexpected output #407 — After the grep | sed | head pipeline, check if any lines were emitted; if empty, print a fallback hint (e.g. "(compose failed with no recognisable error lines — see full log below)") instead of leaving a blank gap between the "✗ failed:" banner and the log path.

Files

• dream-server/dream-cli — _compose_run_with_summary function only

Rationale for merge

Literally the same function body, two consecutive edits in adjacent blocks. One PR, one review round. Merging avoids two back-to-back PRs stomping on identical diff territory.

Implementation notes

• SIGINT trap must use $_compose_log variable capture at trap-set time (double-quote trap string) to avoid the persistence-leak pattern that bit PR-9 (dream status --json exits 1 on all platforms — RETURN trap leaks from cmd_status_json into cmd_status #413).
• Zero-grep-match fallback can be a simple [[ $(wc -l <<<"$_surfaced") -eq 0 ]] check after the pipeline, or refactor to capture grep output into a variable first.

Discovery context

Filed during 23APR audit/fix cycle, both as PR-10 CG follow-ups. Both live scenarios exist: (a) user hits Ctrl-C mid-restart leaving orphaned /tmp/tmp.* compose logs, (b) docker compose fails with error messages that don't match error|unhealthy|failed|dependency (e.g. "no such service: X") producing a blank-body error banner — observed live during dream restart dream-does-not-exist test in the 23APR end-to-end verification.

Closes #405, #407. Labels: bug

[yasinBursali]

Addressed in upstream PR Light-Heart-Labs#1016. (Draft pending upstream Light-Heart-Labs#999+Light-Heart-Labs#1001 merge.)