Add model selection and file creation diffs

[roprgm]

Summary

• add a turn-scoped model selector to the composer and forward the validated model through Eve request attributes
• show unified diffs for newly created files and omit zero-deletion activity stats
• clarify file editing guidance, remove the obsolete Vite scaffold skill, and update architecture documentation

Why

Users need explicit control over the model used for each turn, while file creation activity should be as inspectable as file replacement activity. The previous runtime always used one fixed model and skipped diffs when a file did not already exist.

Impact

Model choice remains transient browser state and is not persisted in Convex. New file writes now include bounded diffs, giving the activity UI consistent additions and deletions data.

Validation

• bun run check
• bun run test (52 tests)
• bun run build

[vercel]

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Project	Deployment	Actions	Updated (UTC)
eve-code	Ready	Preview, Comment	Jul 24, 2026 6:27pm