Triage phase now audits dependsOnTaskId chains before handoff: distinguishes real
from artificial (plan-numbered) dependencies, resolves artificial ones via
update_task, groups survivors into a wave plan, and checks the wave count against
the 4-handoff cap (2 merge rounds) so a chain too long to finish says so explicitly
instead of stranding mid-run.
Merge phase now reads a task's own diff when preview_merge_set's changedFileCount
is below 5, reserving the sonnet review subagent for larger diffs where the
context-protection cost is actually worth it.
Updates DefaultFor_merge_helper_merge_never_reads_diffs_itself, renamed to
DefaultFor_merge_helper_merge_gates_the_diff_subagent_on_a_file_count_threshold,
to match the new threshold behavior.
Mika Kuns
9e80564665