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/config.lua

@@ -5,7 +5,7 @@ local M = {}
 ---@type CoderConfig
 local defaults = {
   llm = {
-    provider = "ollama",
+    provider = "ollama", -- Options: "claude", "ollama", "openai", "gemini", "copilot"
     claude = {
       api_key = nil, -- Will use ANTHROPIC_API_KEY env var if nil
       model = "claude-sonnet-4-20250514",
@@ -14,9 +14,21 @@ local defaults = {
       host = "http://localhost:11434",
       model = "deepseek-coder:6.7b",
     },
+    openai = {
+      api_key = nil, -- Will use OPENAI_API_KEY env var if nil
+      model = "gpt-4o",
+      endpoint = nil, -- Custom endpoint (Azure, OpenRouter, etc.)
+    },
+    gemini = {
+      api_key = nil, -- Will use GEMINI_API_KEY env var if nil
+      model = "gemini-2.0-flash",
+    },
+    copilot = {
+      model = "gpt-4o", -- Uses GitHub Copilot authentication
+    },
   },
   window = {
-    width = 0.25, -- 25% of screen width (1/4)
+    width = 25, -- 25% of screen width (1/4)
     position = "left",
     border = "rounded",
   },
@@ -27,6 +39,14 @@ local defaults = {
   },
   auto_gitignore = true,
   auto_open_ask = true, -- Auto-open Ask panel on startup
+  auto_index = false, -- Auto-create coder companion files on file open
+  scheduler = {
+    enabled = true, -- Enable event-driven scheduler
+    ollama_scout = true, -- Use Ollama as fast local scout for first attempt
+    escalation_threshold = 0.7, -- Below this confidence, escalate to remote LLM
+    max_concurrent = 2, -- Maximum concurrent workers
+    completion_delay_ms = 100, -- Wait after completion popup closes
+  },
 }
 
 --- Deep merge two tables
@@ -67,16 +87,38 @@ function M.validate(config)
     return false, "Missing LLM configuration"
   end
 
-  if config.llm.provider ~= "claude" and config.llm.provider ~= "ollama" then
-    return false, "Invalid LLM provider. Must be 'claude' or 'ollama'"
+  local valid_providers = { "claude", "ollama", "openai", "gemini", "copilot" }
+  local is_valid_provider = false
+  for _, p in ipairs(valid_providers) do
+    if config.llm.provider == p then
+      is_valid_provider = true
+      break
+    end
   end
 
+  if not is_valid_provider then
+    return false, "Invalid LLM provider. Must be one of: " .. table.concat(valid_providers, ", ")
+  end
+
+  -- Validate provider-specific configuration
   if config.llm.provider == "claude" then
     local api_key = config.llm.claude.api_key or vim.env.ANTHROPIC_API_KEY
     if not api_key or api_key == "" then
       return false, "Claude API key not configured. Set llm.claude.api_key or ANTHROPIC_API_KEY env var"
     end
+  elseif config.llm.provider == "openai" then
+    local api_key = config.llm.openai.api_key or vim.env.OPENAI_API_KEY
+    if not api_key or api_key == "" then
+      return false, "OpenAI API key not configured. Set llm.openai.api_key or OPENAI_API_KEY env var"
+    end
+  elseif config.llm.provider == "gemini" then
+    local api_key = config.llm.gemini.api_key or vim.env.GEMINI_API_KEY
+    if not api_key or api_key == "" then
+      return false, "Gemini API key not configured. Set llm.gemini.api_key or GEMINI_API_KEY env var"
+    end
   end
+  -- Note: copilot uses OAuth from copilot.lua/copilot.vim, validated at runtime
+  -- Note: ollama doesn't require API key, just host configuration
 
   return true
 end