v6.9.0

• fix: satisfy clippy for scheduler registration
• chore: release a3s-code 6.9.0
• feat(sdk): expose task scheduler stats
• fix: surface prompt hook denials
• fix: deliver pre-prompt rewrites to the model
• fix: honor lifecycle hook timeouts
• feat: align instructions and lifecycle hooks
• feat(context): layer project instructions
• feat(scheduler): prioritize work across agent sessions
• fix(sandbox): preserve Windows broker state root
• fix(sandbox): normalize Windows Node entry paths
• feat(permissions): expose catastrophic shell floor
• fix(queue): honor lane scheduling configuration
• feat(agent): expose immutable remote run changes
• feat(context): pin deterministic tool result transforms
• feat(context): emit bounded tool result evidence
• feat(context): bind exact cognitive package generations