Napper LSP: Phase 1-2 scaffold, shared features, 14 integration tests

[MelbourneDeveloper]

TLDR;

New napper-lsp F# language server (Phase 1-2 only — NO cutover). Replaces duplicated TypeScript parsing logic with shared F# in Napper.Core. 14 integration tests over real JSON-RPC stdio.

Details

New Napper.Core modules (shared by CLI and LSP):

• CurlGenerator.fs — generates curl commands from NapRequest
• SectionScanner.fs — finds [section] header positions for document symbols
• Environment.detectEnvironmentNames — scans .napenv.* files, returns env names

New LSP project (src/Nap.Lsp/):

• stdio JSON-RPC transport via Ionide.LanguageServerProtocol
• textDocument/documentSymbol — sections for .nap and .naplist (replaces extractHttpMethod, parsePlaylistStepPaths in TS)
• textDocument/codeLens — request section detection (replaces CodeLens TS parsing)
• workspace/executeCommand:
  • napper.requestInfo — method + URL + headers (replaces parseMethodAndUrl in TS)
  • napper.copyCurl — curl string (replaces curl generation in TS)
  • napper.listEnvironments — env names (replaces detectEnvironments in TS)

Specs updated: LSP-SPEC, LSP-PLAN, IDE-EXTENSION-SPEC, IDE-EXTENSION-PLAN, ZED-EXTENSION-PLAN, Claude.md

No existing code modified. LSP is a parallel project — cutover is Phase 3 (not started).

How do the tests prove the change works

14 integration tests in src/Nap.Lsp.Tests/ — each launches the real napper-lsp binary as a subprocess and talks JSON-RPC over stdio (the exact same protocol VSCode and Zed use):

• initialize handshake returns correct capabilities
• initialized notification accepted
• didOpen/didChange/didClose document sync
• shutdown + exit clean lifecycle
• malformed request survives gracefully
• unknown method returns LSP error
• documentSymbol returns sections for .nap file (meta, request, assert)
• documentSymbol returns sections for .naplist file (meta, steps)
• codeLens returns lenses for .nap request sections
• executeCommand requestInfo returns parsed method + URL
• executeCommand copyCurl returns curl string
• executeCommand listEnvironments returns env names from .napenv.* files