[MMinasyan]

Changes

• Give prepared executions and individual Engine invocations explicit resource ownership; archive only quiescent Sessions.
• Record request and argument-hook evidence at existing effect boundaries, retain accepted hook order, normalize original arguments once, and report failed publications through completion.
• Preserve tool execution uncertainty and original outcomes through pure output shaping; support application permission evaluators and replaceable context strategies with self-contained checkpoints.
• Capture effective model pricing at admission and expose read-time approximate USD estimates without repricing history or duplicating copied charges. Lost uncommitted maintenance evidence remains unknown rather than known zero.
• Advance exact protocol compatibility to 6 and store schema to 13; incompatible stores fail explicitly without migration.

Tests

• Regressions cover disposal, hook-array mutation, accepted provenance, unchanged and repaired argument normalization, tool uncertainty, shaping failures, injected evaluators, retained checkpoint sources and pairing, publication failures and managed cancellation, maintenance recovery gaps, captured pricing, and forks.
• Full Go suite and Wails build passed.
• CI passed, including formatting, race/integration tests, security/lint checks, frontend tests, and generated-contract checks.