Surface contribution workflow and DoR/DoD in repo

[JoshuaAFerguson]

Summary

Contribution quickstart and Definition of Ready/Done exist in design docs but are not surfaced in repo templates.

Scope

• CONTRIBUTING.md, PR template, or docs references

Acceptance Criteria

• Link or incorporate DoR/DoD and contribution quickstart into CONTRIBUTING/PR template.
• Keep guidance lightweight; align with existing templates.

References

• ../streamspace-design-and-governance/05-delivery-plan/definition-of-ready-done.md
• ../streamspace-design-and-governance/09-risk-and-governance/contribution-quickstart.md

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Agent Assignment: Scribe (Agent 4)
Priority: P2 - Medium (v2.0-beta.2)
Milestone: v2.0-beta.2