submit_up composed submit_pm_review (atomic) then create_pr (side
effect), but VerbRunner.run_intent runs all composes before any side
effect. submit_pm_review rejects without a PR (returns None), then
create_pr deref'd the None task -> 'NoneType has no attribute
branch_name', wedging cell-PM bubble-up in a respawn loop.
Add IntentSpec.pre_side_effects, run before composes. submit_up now
opens the cell->root PR first (persisting pr_number), so submit_pm_review
re-fetches and passes its pr_created gate. Mirrors the dev open_pr ->
i_am_done split. Latent since the lifecycle spec (207aaec); first run to
reach cell-PM bubble-up exposed it.
Renn F
c78395f9fc