Task #157 — spine-cap allows planning fanout across cells:
main-pm's pattern is to delegate planning to be-pm / fe-pm / ux-pm
in parallel — each on a different team. The previous spine-cap
rejected all planning siblings under one parent as
over-decomposition. New helper _is_cross_team_planning skips the
cap for planning when both teams are non-empty and distinct. Code
/ documentation stay capped regardless (single repo on one branch
shouldn't have two simultaneous code subtasks).
Task #159 — tracing-gap remediate hints every requirement:
journal:during_work>=1, journal:struggle, commits>=1, pr_open,
and self_verified had no entries in _hint_for_missing_key, so when
they were missing the agent saw the token in `missing[]` but the
`remediate` text had no instruction for how to satisfy them.
Smoke-10's be-dev-1 burned multiple turns retrying i_am_done not
knowing scope='reflect' doesn't count toward during_work. Now
every token has a hint, the during_work hint warns that reflect
doesn't satisfy it, and multi-hint remediate uses a numbered list
so the model treats each requirement as a distinct step instead
of a semicolon-blob.
Also coerce convert_plan._coerce_risk formatting (ruff-format follow-up
to 9cd73d0).
