chore: upgrade eve 0.20.0 → 0.25.2

[Rishavraaj]

Summary

• Upgrades eve from 0.20.0 to 0.25.2 in apps/ai-agent and apps/web
• No breaking changes affect zuko (confirmed: no subagents, no maxSubagentDepth, no ExperimentalWorkflow, no .eve/**/*.d.ts tsconfig include)

Changes

• apps/ai-agent/package.json: eve 0.20.0 → 0.25.2
• apps/web/package.json: eve ^0.20.0 → ^0.25.2
• bun.lock: updated

Notable improvements in 0.20 → 0.25.2

Fixes that directly benefit zuko:

• Prompt caching fix (0.22.2): Cache hit rate was ~50% due to a wrong breakpoint placement — now near-full prefix hits. Reduces token costs and latency on every turn
• Session stream reconnect (0.24.5): Retries transient network failures while reopening client session streams so active turns stay attached
• Turn cancellation (0.24.6): POST /eve/v1/session/:sessionId/cancel now available on the HTTP channel
• MCP schema fix (0.25.2): $defs references in tool schemas now validate correctly

Breaking changes (none apply to zuko):

• 0.23.0: agent delegation tool root-only — zuko has no subagents
• 0.23.0: maxSubagentDepth removed — zuko never sets it
• 0.24.0: ExperimentalWorkflow → experimental_workflow() — not used in zuko

Test plan

• bun nx run @zuko/ai-agent:build passes
• Eve agent starts and responds to chat messages in dev
• No TypeScript errors in apps/ai-agent (bun nx run @zuko/ai-agent:typecheck)

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