refactor(nvim,zsh): remove Mason; use Home-Manager-provisioned tooling

LSPs, formatters, linters, and the lldb-dap debugger now come from
~/.nix-profile/bin (see nix/common.nix). lspconfig keeps the default
configs; we just opt-in via vim.lsp.enable() with an explicit list.

Changes:
  - dot_config/nvim/lua/plugins/lsp.lua: drop mason*, replace
    mason-lspconfig handler with explicit vim.lsp.enable({...}); drop
    groovy/jenkins formatters and lint entries; drop systemd lint
    (nginx + groovy + systemdlint tools dropped per plan).
  - dot_config/nvim/lua/plugins/debug.lua: drop mason-nvim-dap; drop
    codelldb adapter; switch dap.configurations.cpp to type='lldb'
    (lldb-dap is the upstream successor, ships with pkgs.lldb).
  - dot_config/nvim/init.lua: remove mason.nvim, mason-lspconfig.nvim,
    mason-tool-installer.nvim, mason-nvim-dap.nvim from vim.pack.add.
  - dot_config/nvim/lua/config/update.lua: remove MasonToolsUpdateSync.
  - dot_config/zsh/dot_zshrc: flip plugin source order — prefer
    ~/.nix-profile/share, fall back to /usr/share/zsh (was the other
    way around).
  - nix/bootstrap.sh: drop the uv-python3.11 step (no longer needed
    once Mason no longer source-builds Python LSPs on Ubuntu 20.04).

Phase 6 of the nix-on-host migration plan.

1 files changed, 4 insertions, 7 deletions

diff --git a/dot_config/nvim/lua/config/update.lua b/dot_config/nvim/lua/config/update.lua
index bc7ee3d..7910dee 100644
--- a/dot_config/nvim/lua/config/update.lua
+++ b/dot_config/nvim/lua/config/update.lua
@@ -1,10 +1,10 @@
 -- Update orchestrator. Invoked from the justfile via:
 --   nvim +'lua require("config.update").run()'
 --
--- Cleans orphan plugins, applies plugin updates without prompting, then
--- runs :MasonToolsUpdateSync. Run interactively (not --headless) so the
--- diff buffer that vim.pack.update opens is actually visible — that
--- buffer IS the changelog. Quit manually with :qa once reviewed.
+-- Cleans orphan plugins then applies plugin updates without prompting.
+-- Run interactively (not --headless) so the diff buffer that
+-- vim.pack.update opens is actually visible — that buffer IS the
+-- changelog. Quit manually with :qa once reviewed.
 
 local M = {}
 
@@ -34,9 +34,6 @@ function M.run()
 
   print("[pack] updating plugins…")
   vim.pack.update(nil, { force = true })
-
-  print("[mason] updating tools…")
-  vim.cmd("MasonToolsUpdateSync")
 end
 
 return M