Add SourceOS interaction reference flow packet

[mdheller]

Summary

Adds the canonical end-to-end reference packet for the SourceOS interaction substrate.

This PR adds:

• examples/interaction-flow/noetica-superconscious-agentplane-agentterm.flow.json
• docs/contract-additions/sourceos-interaction-reference-flow.md
• tools/validate_interaction_flow_reference.py
• .github/workflows/sourceos-interaction-reference-flow.yml

What the packet pins

The flow records the complete current implementation wave:

Noetica emits SourceOSInteractionEvent
  -> Superconscious binds the task/cognition boundary
  -> AgentPlane attaches execution evidence and replay refs
  -> AgentTerm renders and records the governance trace

It pins current downstream commits for:

• SourceOS-Linux/sourceos-spec
• SocioProphet/Noetica
• SourceOS-Linux/agent-term
• SocioProphet/superconscious
• SocioProphet/agentplane

Boundary posture

No new authority plane is introduced. The packet records the existing authority split: sourceos-spec owns schema/codegen; Noetica and AgentTerm own surfaces; Superconscious owns task/cognition coordination; AgentPlane owns execution evidence and replay; Policy Fabric, Agent Registry, and Memory Mesh remain separate authorities.

Validation expected

python tools/validate_interaction_flow_reference.py

Related

• Add SourceOS interaction substrate for Noetica and AgentTerm #106
• Index SourceOS interaction substrate in contract catalogs #115
• Generate SourceOSInteractionEvent types #117
• Emit SourceOSInteractionEvent from Noetica chat lifecycle SocioProphet/Noetica#16
• Vendor generated SourceOS interaction types SocioProphet/Noetica#17
• Add SourceOS contract sync check SocioProphet/Noetica#18
• Render SourceOSInteractionEvent governance traces agent-term#46
• Vendor generated SourceOS interaction Python types agent-term#47
• Add SourceOS contract sync check agent-term#48
• Bind SourceOSInteractionEvent at Superconscious task boundary SocioProphet/superconscious#60
• Attach AgentPlane refs to SourceOSInteractionEvent evidence binding SocioProphet/agentplane#253