nvim(devcube): disable OSC 52 paste to stop clipboard timeouts

OSC 52 copy is fire-and-forget, but paste sends a clipboard-read query
and blocks on a terminal reply. Ghostty doesn't answer OSC 52 reads, and
the container > zellij > nvim chain won't relay one anyway, so paste hung
until timeout. Keep copy on OSC 52; route paste-in through terminal-level
paste (ctrl+shift+v) instead.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: binarypie

dot_files/nvim/config/lua/hypercube/config.lua

@@ -11,23 +11,34 @@ function M.setup()
     },
   })
 
-  -- Portable clipboard via OSC 52.
+  -- Portable clipboard via OSC 52 (copy only).
   -- Inside the Hypercube container we can't reach the host Wayland/pbcopy
-  -- socket, so route yanks/pastes through the terminal escape sequence. This
+  -- socket, so route yanks out through the terminal escape sequence. This
   -- works locally on Ghostty and over SSH, keeping the sandbox portable.
   -- Gated on DEVCUBE so a host-native nvim keeps its own clipboard.
+  --
+  -- Paste is intentionally NOT wired to OSC 52. Reading the clipboard requires
+  -- querying the terminal and waiting for a reply, but Ghostty (and most
+  -- terminals) don't answer OSC 52 read requests, so nvim blocks until it
+  -- times out. Instead, paste into nvim with terminal/OS-level paste
+  -- (ctrl+shift+v), which arrives as a bracketed paste and never touches the
+  -- +/* registers. The no-op paste handlers below keep those registers from
+  -- triggering the blocking terminal query.
   if vim.env.DEVCUBE == "1" then
     local ok, osc52 = pcall(require, "vim.ui.clipboard.osc52")
     if ok then
+      local noop_paste = function()
+        return { vim.split(vim.fn.getreg(""), "\n"), vim.fn.getregtype("") }
+      end
       vim.g.clipboard = {
-        name = "OSC 52",
+        name = "OSC 52 (copy only)",
         copy = {
           ["+"] = osc52.copy("+"),
           ["*"] = osc52.copy("*"),
         },
         paste = {
-          ["+"] = osc52.paste("+"),
-          ["*"] = osc52.paste("*"),
+          ["+"] = noop_paste,
+          ["*"] = noop_paste,
         },
       }
     end