Complete Phase 4 VS Code Deep Integration

[LonelyQuantum]

Complete Phase 4 VS Code Deep Integration

Summary

This PR completes the Phase 4 VS Code deep integration work for ProleCoder, moving the extension from the Phase 3 RPC foundation into a fuller editor experience with native VS Code chat, richer run control, approval UX, packaging smoke checks, and deterministic extension-host coverage.

It adds shared protocol support for provider capabilities, event batching, cancellation, run list/resume, FIM previews, persistent approvals, and hunk-level patch approvals, then wires those capabilities through the Rust RPC server, Agent Core, CLI, and VS Code extension.

What Changed

• Added native VS Code integration paths:

  • @prole Chat Participant registration and turn runner
  • Sidebar Chat send/cancel flow against real agent.sendTurn / agent.cancel
  • Run List and agent.resume replay support
  • Context Capsule visualization in the sidebar
  • Problems diagnostics as agent.sendTurn.attachments

• Expanded approval and tool-control behavior:

  • Terminal command approval payloads include command, cwd, risk, reasons, and output summaries
  • Session/workspace persistent approvals are supported in Core/RPC
  • Approval UI is simplified to Approve / Reject, with hunk selection preserved for patch approvals
  • apply_patch hunk-level approval metadata and filtering are implemented

• Added model/provider integration:

  • Provider capability data contract in agent.initialize
  • DeepSeek FIM preview support
  • agent.previewFim RPC method and VS Code inline completion provider
  • Capability-driven FIM model selection without model-name inference

• Improved RPC and event infrastructure:

  • High-frequency agent.eventBatch notification support
  • Protocol fixture alignment for event payloads
  • Protocol mismatch diagnostics
  • Typed RPC helpers for sendTurn, cancel, approve/reject, listRuns, resume, and previewFim

• Added packaging and E2E validation:

  • VSIX dry-run packaging smoke script
  • Alpha/pre-release VSIX packaging script
  • @vscode/test-electron extension-host harness
  • Local JSON-RPC fixture server for deterministic VS Code integration tests

• Updated documentation:

  • Phase 4 task tracking
  • VS Code extension docs
  • JSON-RPC protocol docs
  • approval model docs
  • release and testing docs
  • provider capability ADR

Testing

• cargo test --workspace
• pnpm -r typecheck
• pnpm -r lint
• pnpm -r test
• pnpm run vscode:test-electron
• pnpm run vsix:smoke
• pnpm run vsix:alpha
• git diff --check
• sensitive information scan

Notes

• Live DeepSeek execution still requires DEEPSEEK_API_KEY to be provided through the existing CLI/RPC environment path.
• The generated VSIX is still treated as an alpha/pre-release artifact.
• Hunk-level approval is currently scoped to apply_patch unified diff workflows.