fix(lsp): migrate to vim.lsp.config and clear startup crash

[tmas333]

Summary

Neovim was crashing on startup with a stack trace ending at init.lua:664, and two LSP clients (stylua, Copilot) were dying every session. This PR fixes the crash and the spurious stylua LSP client, and bundles accumulated plugin work that had been lingering in the working tree.

What was broken

• require('lspconfig').<server>.setup() is deprecated on nvim 0.11 and will be removed in nvim-lspconfig v3.0.0. The framework's __index was already raising on .ruff / .basedpyright, producing the stack trace.
• nvim-lspconfig now ships a community lsp/stylua.lua definition. The old mason-lspconfig handlers block was iterating over every mason-installed package whose name matched a known lspconfig server — so the stylua formatter was being launched as an LSP server with --lsp, exiting 2 every startup.
• The third error (Copilot: Process exited with status 243) is an npm cache permission issue on the local machine (EACCES on ~/.npm/_npx/...). Not a config bug — see verification notes below.

What this PR does

Commit 1 — fix(lsp) (init.lua only)

• Replaces the deprecated require('lspconfig').xxx.setup(...) pattern with native 0.11 API: vim.lsp.config(name, cfg) + vim.lsp.enable(name).
• Folds ruff and basedpyright into the main servers table so they get the blink.cmp capability merge and Mason auto-install like everything else.
• Drops mason-lspconfig.setup { handlers = ... } entirely. With handlers gone, only names explicitly handed to vim.lsp.enable are ever launched — stylua cannot be mis-started as an LSP again. It stays in mason-tool-installer's list as a formatter for conform.nvim.

Commit 2 — chore(plugins) (everything else that was sitting in the working tree)

• New: code_companion, golf, neotest (rustaceanvim adapter), nvim-bacon, vim-pencil, quickscope.
• Modified: rustaceanvim → ^6 with clippy/rustfmt config + neotest dep; obsidian checkbox order; trouble keymaps reworked (<leader>xx → <leader>xd, add <leader>xl sidebar toggle).
• Deleted: cyberdream (tokyonight is the active colorscheme now).

Test plan

• Out-of-band first: sudo chown -R 501:20 ~/.npm — fixes the Copilot 243 error (root-owned files in ~/.npm/_npx/). This is system state, not in the diff.
• nvim from $HOME — no stack trace, no deprecation warning, no Client stylua quit notification.
• Open a .lua file → :LspInfo shows lua_ls attached and no stylua client.
• Open a .py file → :LspInfo shows both ruff and basedpyright.
• Open .tf, ansible .yml, plain .yaml → corresponding server attaches.
• <leader>f on a Lua file still formats via stylua (through conform.nvim).
• :Mason lists ruff, basedpyright, stylua, lua-language-server, terraform-ls, tflint, ansible-language-server, yaml-language-server all installed.
• :checkhealth lsp clean.
• After the chown, :CopilotChat opens without spawning a 243 exit, and ~/.local/state/nvim/lsp.log shows no new stylua --lsp or EACCES errors.

🤖 Generated with Claude Code

[tmas333]

Closing — opened against upstream by mistake, this should target my fork. Sorry for the noise.