Replace the oversized packet model with the requested JSON-friendly packet shape and thread it through the in-memory task registry. Add the RunTaskPacket tool so callers can launch packet-backed tasks directly while preserving existing task creation flows.
Constraint: The existing task system and tool surface had to keep TaskCreate behavior intact while adding packet-backed execution
Rejected: Add a second parallel packet registry | would duplicate task lifecycle state
Confidence: high
Scope-risk: moderate
Reversibility: clean
Directive: Keep TaskPacket aligned with the tool schema and task registry serialization when extending the packet contract
Tested: cargo build --workspace; cargo test --workspace
Not-tested: live end-to-end invocation of RunTaskPacket through an interactive CLI session
