Add lsp-setup skill for configuring LSP servers in Copilot CLI

[brunoborges]

Summary

Adds a new lsp-setup skill that guides users through installing and configuring Language Server Protocol (LSP) servers for GitHub Copilot CLI.

What it does

The skill provides an interactive workflow:

1. Asks which language(s) the user wants LSP support for
2. Detects the user's OS (macOS / Linux / Windows)
3. Installs the appropriate LSP server
4. Writes the lsp-config.json configuration (user-level or repo-level)
5. Verifies the setup

Included languages

Bundled reference data covers 14 languages with per-OS install commands and ready-to-use config snippets:

Language	LSP Server
TypeScript / JavaScript	typescript-language-server
Java	Eclipse JDT Language Server (jdtls)
Python	pylsp / Pyright
Go	gopls
Rust	rust-analyzer
C / C++	clangd
C#	csharp-ls
Ruby	solargraph
PHP	intelephense
Kotlin	kotlin-language-server
Swift	sourcekit-lsp
Lua	lua-language-server
YAML	yaml-language-server
Bash	bash-language-server

Files changed

• skills/lsp-setup/SKILL.md — skill definition and agent instructions
• skills/lsp-setup/references/lsp-servers.md — bundled reference data
• docs/README.skills.md — auto-generated (via npm run build)

Validation

• ✅ npm run skill:validate — all 272 skills valid
• ✅ npm run build — README and marketplace regenerated
• ✅ bash scripts/fix-line-endings.sh — line endings normalized

[github-actions]

🔍 Skill Validator Results

2 resource(s) checked | ✅ All checks passed

Full output

Found 1 skill(s)
[lsp-setup] 📊 lsp-setup: 815 BPE tokens [chars/4: 830] (detailed ✓), 6 sections, 1 code blocks
�[32m✅ All checks passed (1 skill(s))�[0m

[Copilot]

Pull request overview

Adds a new lsp-setup skill to help users install/configure Language Server Protocol (LSP) servers for GitHub Copilot CLI, including bundled per-language install guidance and example configuration snippets.

Changes:

• Add skills/lsp-setup skill instructions describing an interactive LSP setup workflow and config locations/format.
• Add bundled reference data (references/lsp-servers.md) covering install commands + config snippets for 14 languages.
• Update docs/README.skills.md to include the new skill entry.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
skills/lsp-setup/SKILL.md	Defines the LSP setup workflow, config locations, and expected JSON structure.
skills/lsp-setup/references/lsp-servers.md	Provides per-language install commands and config snippets used by the skill.
docs/README.skills.md	Registers the new skill in the skills index.

Comments suppressed due to low confidence (1)

skills/lsp-setup/SKILL.md:28

• This section lists only ~/.copilot/lsp-config.json and .github/lsp.json as config locations, but the Learning Hub plugin docs also mention lsp.json at the repo root as a valid location. If root lsp.json is supported, include it here (and in the scope question) so the skill doesn’t omit a documented option.

Copilot CLI reads LSP configuration from two locations (repo-level takes precedence):

- **User-level**: `~/.copilot/lsp-config.json`
- **Repo-level**: `.github/lsp.json`

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

[Copilot]

The skill only offers repo-level config at .github/lsp.json, but repo docs also mention lsp.json at the repo root as a valid location for LSP server configs. Consider offering both options (and clarifying precedence) so users don’t end up writing to a path Copilot CLI won’t read in their setup.