feat(completion): add blink-cmp-tmux

lua/astrocommunity/completion/blink-cmp-tmux/README.md

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+# Completion source using tmux for blink.cmp 
+
+Port of the andersevenrud/cmp-tmux completion source for the blink.cmp Neovim plugin.
+
+## Features
+
+- Integrates with tmux to provide completion suggestions based on the content of tmux panes.
+- Supports capturing content from all panes or only the current pane.
+- Allows capturing the history of panes for more comprehensive suggestions.
+- Configurable trigger characters to activate completions.
+
+**Repository:** <https://github.com/mgalliou/blink-cmp-tmux>

lua/astrocommunity/completion/blink-cmp-tmux/init.lua

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+return {
+  "mgalliou/blink-cmp-tmux",
+  lazy = true,
+  specs = {
+    {
+      "Saghen/blink.cmp",
+      optional = true,
+      opts = {
+        sources = {
+          default = { "tmux" },
+          providers = {
+            tmux = { name = "tmux", module = "blink-cmp-tmux" },
+          },
+        },
+      },
+    },
+  },
+}