Add generated Agent Chat conversation titles

[h4yfans]

Summary

• Generate a short Agent Chat conversation title from the first submitted prompt using the selected backend subprocess.
• Persist the generated title through the encrypted conversation store and broadcast conversation_updated so the sidebar/header refreshes without reload.
• Keep title generation isolated from Memry MCP tools and document the behavior in the Agent Chat guide.

Verification

• pnpm exec vitest run --config config/vitest.config.ts --project main src/main/agent/runtime/__tests__/turn.test.ts
• pnpm exec vitest run --config config/vitest.config.ts --project renderer src/renderer/src/agent-chat/__tests__/agent-context.test.tsx
• pnpm exec vitest run packages/contracts/src/ipc-agent.test.ts
• pnpm --filter @memry/contracts typecheck
• pnpm --filter @memry/desktop typecheck:node
• pnpm --filter @memry/desktop typecheck:web
• pnpm docs:impact --strict --base origin/main
• pnpm docs:build
• pnpm ipc:check
• git diff --check origin/main...HEAD
• Pre-push hook: docs impact/build, contract and architecture checks, package/desktop/sync-server typechecks, desktop tests, sync-server tests

[vercel]

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Project	Deployment	Actions	Updated (UTC)
memry-docs	Building	Preview	May 11, 2026 8:43pm
memrynote-landing	Ready	Preview, Comment	May 11, 2026 8:43pm