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* fix(notifications): exponential backoff + CAS claim for expired-unacked re-escalation The sweep re-escalated every expired unacked ack-required notification on every ~60s tick, forever — the live incident: 3 fresh blocker escalations + Telegram DMs per minute from a static stale pile. Now each notification carries reescalation_count / last_reescalated_at / reescalation_delivered_count (migration 079): first fire at expiry, then doubling intervals from 1h capped at 24h, hard stop after ROBOCO_NOTIFICATION_MAX_REESCALATIONS (default 5) with one permanent log carrying attempts-vs-delivered so 'seen and ignored' is distinguishable from 'route never worked'. The due/wait/capped decision is a pure function in foundation/policy/communications.py. Per adversarial review, the attempt slot is claimed by compare-and-set (UPDATE ... WHERE reescalation_count = :n) BEFORE delivery — the previous draft leaned on the 60s dedup window, which never engages for BLOCKER_ESCALATION (_LOOP_PRONE_TYPES excludes it), so concurrent sweeps would have double-delivered. A lost claim skips delivery outright. Legacy rows read as count=0 and keep today's first-fire semantics. 61 tests incl. a two-session CAS race and a real alembic upgrade/downgrade round trip. * feat(budgets): per-task and per-project cost budgets (flag-gated) tasks.budget_usd + projects.monthly_budget_usd (migration 080, chained on 079; adds ix_agent_spawn_sessions_task_id since both enforcement seams filter on bare task_id). Behind ROBOCO_TASK_BUDGETS_ENABLED (default off, feature-flags card) — verifiably inert when off. Claim-time: a project-month-spend guard applies to WORK-STARTING claims only (i_will_work_on / i_will_plan) — per adversarial review, review/ doc/gate/inbound-PR claims are exempt so in-flight work can always finish reviewing and merging at cap. Spend counts closed sessions' estimated_cost_usd PLUS open sessions priced live from token snapshots (the original closed-only sum read parallel long sessions as $0). Sweep-side: the existing budget sweep also prices the active task's spend vs budget_usd (TaskType defaults when null); on breach the task is BLOCKED (HUMAN resolver, budget marker) BEFORE the graceful stop so the unclaim no-ops and the dispatcher never respawns onto it, and the CEO notification names both recovery steps. unblock on a budget-blocked task re-checks live spend and refuses while still over — no silent re-breach loop. Panel: budget inputs in both dialogs (0 rejected — a zero budget silently blocks everything), spend logic consolidated in TaskService.task_spend_usd. 42 new tests incl. a real-DB spend-query suite and a two-tick non-refire sweep test. --------- Co-authored-by: Renn F <rennf93@users.noreply.github.com>