[Space Goat (spacegoatai)]

Summary

This PR contributes several additive language servers and production hardening improvements developed while running multilspy at scale across 750+ open-source repositories:

1. Four New Language Servers (13 → 17 Supported Languages)

• Scala (Language.SCALA) — MetalsServer:
  • Auto-bootstraps isolated coursier + metals binary into language_servers/metals_server/metals_bin/ if not already on PATH.
  • Automatically detects and imports sbt (build.sbt), Maven (pom.xml), Mill (build.sc), and Gradle (build.gradle / build.gradle.kts) builds via Bloop (metals/build-import).
• Swift (Language.SWIFT) — SourceKitLSPServer:
  • Auto-discovers sourcekit-lsp via PATH or xcrun --find sourcekit-lsp on macOS.
  • Supports SwiftPM (Package.swift) workspaces and monitors background indexing notifications.
• Lua (Language.LUA) — LuaLSServer:
  • Auto-downloads the platform-matched lua-language-server release binary (darwin-arm64, darwin-x64, linux-x64, linux-arm64, win32-x64) on first run.
  • Handles workspace/configuration and waits for initial workspace diagnosis before serving symbol queries.
• Bash / Shell (Language.BASH) — BashLanguageServer:
  • Bootstraps bash-language-server locally via npm (5.4.3) if node/npm are available, with a pure-Python AST/regex fallback for textDocument/documentSymbol and workspace-wide textDocument/definition / textDocument/references when Node.js is unavailable.

2. Per-Request Timeout & Server Health Checks

• MultilspyConfig.request_timeout: Optional[float] = 120.0 (default 120s; None for unlimited):
  • Prevents hung LSP servers (clangd, rust-analyzer, eclipse.jdt.ls, etc.) from blocking SyncLanguageServer callers indefinitely on asyncio.run_coroutine_threadsafe(...).result(timeout=...).
  • Raises MultilspyException("LSP request <method> timed out after <N>s").
• LanguageServer.check_process_health() / SyncLanguageServer.check_process_health():
  • Allows callers to inspect whether the underlying language server subprocess is still alive before issuing follow-up requests after a timeout.

3. PathClassifier (multilspy.path_classifier)

• Classifies resolved definition file paths into "local" (inside repository_root_path), "stdlib" (language standard library / runtime SDK across Python, Go, Rust, JS/TS, Java, Kotlin, Scala, C/C++, C#, Ruby, Dart, Swift, Lua, Bash), "external" (third-party package caches such as site-packages, node_modules, .cargo/registry, .m2, .ivy2, pkg/mod), or "unknown".

4. Tests

• Full unit test suites for all new components:
  • tests/multilspy/test_metals_unit.py
  • tests/multilspy/test_sourcekit_unit.py
  • tests/multilspy/test_lua_ls_unit.py
  • tests/multilspy/test_bash_ls_unit.py
  • tests/multilspy/test_request_timeout.py
  • tests/multilspy/test_path_classifier.py
• End-to-end integration tests for Scala, Swift, Lua, and Bash.
• All 75 unit tests pass cleanly on v0.1.1.

(Happy to split this into smaller PRs by language/feature if the maintainers prefer!)

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