feat(lsp): add multi-server support to CodeMirror LSP client

[bajrangCoder]

Summary

Vendor @codemirror/lsp-client into packages/lsp-client and add support
for attaching multiple independent language servers to a single CodeMirror
editor.

Implementation

• Add multiple LSPClient bindings per EditorView
• Add server priority and per-feature provider selection
• Maintain independent synchronization state for each client
• Aggregate results from compatible providers:
  • completions
  • hover
  • diagnostics
  • code actions
  • references
  • document colors
  • inlay hints
• Route single-owner operations to the highest-priority capable server:
  • formatting
  • rename
  • definitions and navigation
  • signature help
  • document symbols
• Preserve diagnostics from every attached server
• Isolate provider failures so one server cannot suppress results from others
• Clean up client-specific state when a server is detached

[greptile-apps]

Greptile Summary

The PR vendors the CodeMirror LSP client and extends Acode’s LSP integration to support multiple independently configured servers per editor.

• Adds per-client synchronization, priority, feature selection, and lifecycle management.
• Aggregates compatible multi-provider results while routing single-owner operations to the highest-priority provider.
• Stores and clears diagnostics independently for each attached client.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
packages/lsp-client/src/plugin.ts	Adds multiple client-specific plugin bindings, feature gating, priority ordering, and independent synchronization state.
src/cm/lsp/clientManager.ts	Attaches multiple server clients to each editor and coordinates per-client feature configuration and cleanup.
src/cm/lsp/diagnostics.ts	Separates diagnostics by client and now consistently enforces diagnostics feature opt-out across push, pull, refresh, and display paths.
tests/unit/lspMultiClient.test.js	Exercises multi-client selection, aggregation, isolation, and cleanup behavior.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  View[EditorView] --> Manager[LspClientManager]
  Manager --> P1[LSPPlugin: Server A]
  Manager --> P2[LSPPlugin: Server B]
  P1 --> A[Aggregate compatible features]
  P2 --> A
  P1 --> S[Select highest-priority owner]
  P2 --> S
  A --> View
  S --> View

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_{Reviews (2): Last reviewed commit: "fix(lsp): honor diagnostics provider opt..." | Re-trigger Greptile}