[FEATURE] Session replay and tutorial view for public projects

[aernw]

Objective

Turn version history into a replayable and educational surface for public projects.

Scope

• session replay based on version history and previews
• tutorial-oriented presentation of key version steps
• educational framing around how a public project evolved

Out of Scope

• [Features explicitly not included]
• [Future enhancements to defer]

Acceptance Criteria

• replay is useful both for learning and for product differentiation
• tutorial value is grounded in real project history rather than generic content

Dependencies

Blocked by: (none)

Blocks: (none)

Success Metrics

• [How to measure success - optional]

Roadmap Context

Milestone: M6 - Productization & Coverage Expansion
Parent workstream(s): #162, #212