chore: remove dead electric-proxy stub and stale streams docs

[saddlepaddle]

Summary

• Remove apps/electric-proxy/ — empty stub package that never had source code
• Remove 4 outdated docs that reference the old self-hosted apps/streams server (now replaced by Electric Cloud managed service)
• Clean up .env.example — remove STREAMS_PORT, STREAMS_INTERNAL_*, STREAMS_DATA_DIR vars for the defunct self-hosted server
• Update AGENTS.md structure list to remove apps/streams and apps/electric-proxy

Test plan

• bun run lint:fix — pass
• bun run typecheck — pass
• bun test — pass (1230 pass, 0 fail)
• bunx sherif --fix — pass

Summary by CodeRabbit

• Chores

  • Removed Streams service and Electric Proxy components from project configuration, package manifests, and environment variables.
  • Cleaned up related service declarations and configuration entries.

• Documentation

  • Removed comprehensive documentation files covering architectural planning, production deployment strategies, streaming performance and reliability recommendations, and AI chat system implementation guidance.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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📝 Walkthrough

Walkthrough

This PR removes the Streams service (apps/streams), electric-proxy package, Streams-related environment variables from .env.example, associated documentation files, and updates AGENTS.md to reflect these removals. Total: 12 environment variables removed, 2 AGENTS.md entries deleted, 1 package.json file deleted, and 4 documentation files deleted (2,263 lines total).

Changes

Cohort / File(s)	Summary
Environment Configuration .env.example	Removed five Streams-related environment variables: NEXT_PUBLIC_STREAMS_URL, STREAMS_PORT, STREAMS_INTERNAL_PORT, STREAMS_INTERNAL_URL, and STREAMS_DATA_DIR from the Freestyle section.
Project Manifest AGENTS.md, apps/electric-proxy/package.json	Removed entries for apps/streams (Streams service) and apps/electric-proxy (Electric proxy service) from AGENTS.md; deleted the entire electric-proxy package.json manifest file.
Documentation docs/ai-chat-plan.md, docs/productionize-chat.md, docs/realign-streams-architecture.md, docs/streaming-performance-reliability-recommendations.md	Deleted four comprehensive documentation files totaling 2,263 lines, including architecture plans for AI chat, production rollout guides, Streams architecture alignment strategy, and performance/reliability recommendations.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• feat: add Electric Cloud managed service support #1572: Modifies electric-proxy route configuration and header handling, directly touching the same component being removed in this PR.
• fix(streams): streaming correctness, reliability, and performance overhaul #1391: Makes extensive code-level changes to apps/streams and desktop streaming logic, creating direct conflicts with the service removal.
• Added Claude SDK endpoint #1250: Adds Claude SDK endpoint and new modules inside apps/streams, which directly conflicts with removing the streams service entirely.

Poem

🐰 Farewell, dear streams and proxy true,
Your docs and configs bid adieu,
We've tidied up the garden well,
With cleaner paths to weave and tell. ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: removing dead code and stale documentation related to electric-proxy and streams.
Description check	✅ Passed	The description provides a clear summary of all changes, includes testing results, but is missing the standard template sections like Related Issues and Type of Change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch cleanup/electric-managed

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[github-actions]

🧹 Preview Cleanup Complete

The following preview resources have been cleaned up:

• ✅ Neon database branch
• ✅ Electric Fly.io app

Thank you for your contribution! 🎉