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feat(lsp): add PowerShellEditorServices language server (#55930)

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Registers PowerShell (.ps1/.psm1/.psd1) in the LSP server registry,
spawning PowerShellEditorServices over stdio via a pwsh/powershell
host. PSES ships as a GitHub release zip (no npm/go/pip recipe), so it
sits in the manual install tier alongside rust-analyzer and clangd.

The spawn builder resolves the module bundle from (in order) the
lsp.servers.powershell.command override, init bundlePath, the
PSES_BUNDLE_PATH env var, or <HERMES_HOME>/lsp/PowerShellEditorServices,
then launches Start-EditorServices.ps1 -Stdio with a non-interactive,
no-profile host. hermes lsp status/list report it as manual-only until
pwsh is present.

Docs and tests included.
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Teknium 2026-06-30 16:22:18 -07:00 • committed by GitHub
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5
agent/lsp/install.py
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@ -102,6 +102,11 @@ INSTALL_RECIPES: Dict[str, Dict[str, Any]] = {
# Lua — manual (LuaLS is platform-specific binaries from GitHub
# releases; complex enough that we punt to the user)
"lua-language-server": {"strategy": "manual", "pkg": "", "bin": "lua-language-server"},
# PowerShell — PowerShellEditorServices ships as a GitHub release
# zip driven by a pwsh bootstrap script, not a single binary. We
# require a manual bundle install and probe for the pwsh host so
# `hermes lsp status` reports the host's presence.
"powershell": {"strategy": "manual", "pkg": "", "bin": "pwsh"},
}