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gsxdsm 274318aebf FN-8056: enforce task token budgets

Enforce configured task token budgets whenever session usage is persisted.

- Apply soft alerts and hard pauses atomically from all executor persistence paths.
- Exclude cache-read tokens from budget usage and dispatch budget notifications once.
- Document budget semantics and add regression coverage.

Files changed: .changeset/fn-8056-token-budget-enforcement.md     |   7 ++
 docs/settings-reference.md                         |   2 +
 packages/core/src/types.ts                         |   4 +-
 .../src/__tests__/session-token-usage.test.ts      | 101 ++++++++++++++++++++-
 .../src/__tests__/token-budget-enforcer.test.ts    |  81 ++++++++++-------
 packages/engine/src/executor.ts                    |  22 ++++-
 packages/engine/src/session-token-usage.ts         |   8 +-
 packages/engine/src/token-budget-enforcer.ts       |  98 +++++++++++++++++---
 8 files changed, 262 insertions(+), 61 deletions(-)

Fusion-Task-Id: FN-8056

Fusion-Task-Lineage: 5f5ed522-f950-42ce-b4fd-e0b1d45b5815

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-07-16 01:52:10 -07:00