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 extends Acode’s CodeMirror LSP integration to support multiple independently configured language servers per editor.

• Adds priority-based provider selection for single-owner operations.
• Aggregates compatible results such as diagnostics, code actions, references, colors, and inlay hints.
• Tracks provider identity so follow-up operations are routed back to the server that produced each result.
• Keeps synchronization and cleanup state isolated by client.

Confidence Score: 5/5

The PR appears safe to merge because the previously reported diagnostics opt-out bypass is fixed and no blocking failure remains.

No blocking failure remains.

Important Files Changed

Filename	Overview
src/cm/lsp/clientManager.ts	Attaches multiple prioritized client bindings, passes per-feature enablement into each plugin, and clears client-owned diagnostics during detach and disposal.
src/cm/lsp/diagnostics.ts	Separates diagnostics by client and consistently filters pull, push, synchronization, and rendering paths through diagnostics feature enablement.
src/cm/lsp/codeActions.ts	Aggregates actions from capable providers while retaining the originating plugin for resolution and execution.
src/cm/lsp/documentColors.ts	Aggregates color results and retains provider identity for subsequent color-presentation requests.
src/cm/lsp/inlayHints.ts	Aggregates and deduplicates hints from all enabled, capable providers.
src/cm/lsp/serverRegistry.ts	Sanitizes server priority and returns matching servers in descending priority order.
tests/unit/lspMultiClient.test.js	Covers multi-provider selection and aggregation, including disabled diagnostics synchronization and rejection of pull and push diagnostics.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  E[CodeMirror EditorView] --> R[Server registry ordered by priority]
  R --> P1[LSP binding: server A]
  R --> P2[LSP binding: server B]
  P1 --> A[Aggregate compatible results]
  P2 --> A
  P1 --> S[Select highest-priority capable provider]
  P2 --> S
  A --> F[Diagnostics, actions, references, colors, hints]
  S --> O[Formatting, rename, navigation, symbols]
  P1 --> C[Per-client synchronization and cleanup]
  P2 --> C

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_{Reviews (3): Last reviewed commit: "fix" | Re-trigger Greptile}