feat: add event-driven architecture with scope resolution

- Add event queue system (queue.lua) with priority-based processing
- Add patch system (patch.lua) with staleness detection via changedtick
- Add confidence scoring (confidence.lua) with 5 weighted heuristics
- Add async worker wrapper (worker.lua) with timeout handling
- Add scheduler (scheduler.lua) with completion-aware injection
- Add Tree-sitter scope resolution (scope.lua) for functions/methods/classes
- Add intent detection (intent.lua) for complete/refactor/fix/add/etc
- Add tag precedence rules (first tag in scope wins)
- Update autocmds to emit events instead of direct processing
- Add scheduler config options (ollama_scout, escalation_threshold)
- Update prompts with scope-aware context
- Update README with emojis and new features
- Update documentation (llms.txt, CHANGELOG.md, doc/codetyper.txt)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lua/codetyper/commands.lua

@@ -788,6 +788,12 @@ function M.setup()
     cmd_logs_toggle()
   end, { desc = "Toggle logs panel" })
 
+  -- Index command - open coder companion for current file
+  vim.api.nvim_create_user_command("CoderIndex", function()
+    local autocmds = require("codetyper.autocmds")
+    autocmds.open_coder_companion()
+  end, { desc = "Open coder companion for current file" })
+
   -- Setup default keymaps
   M.setup_keymaps()
 end
@@ -817,6 +823,12 @@ function M.setup_keymaps()
     silent = true,
     desc = "Coder: Toggle Agent panel"
   })
+
+  -- Index keymap - open coder companion
+  vim.keymap.set("n", "<leader>ci", "<cmd>CoderIndex<CR>", {
+    silent = true,
+    desc = "Coder: Open coder companion for file"
+  })
 end
 
 return M