Integrate pi-agent as a blink.cmp completion source (score_offset=100)
for LSP-style completions inside pi-chat-prompt buffers. Add the
pi.nvim plugin with a toggle keymap and --approve mode.
The monolithic vim.pack.add() table in init.lua was removed and each
plugin/*.lua file now declares its own dependencies via vim.pack.add()
at the top. tools.lua was decomposed into per-plugin files (cmake.lua,
jupynvim.lua, just.lua, kulala.lua, mise.lua, neogit.lua, sshfs.lua,
trouble.lua, undotree.lua, zoxide.lua) each with their own config and
keymaps. This makes plugin files self-contained and easier to maintain.
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