feat(captcha): deterministic HTML detection for known providers

internal/captcha/types.go

@@ -0,0 +1,13 @@
+// Package captcha provides deterministic detection and LLM-backed solving of
+// captcha challenges. It never drives a browser and never mints tokens.
+package captcha
+
+// Detection describes one captcha found on a page. Fields are ordered
+// largest-alignment-first for fieldalignment.
+type Detection struct {
+	Type        string `json:"type"`
+	Sitekey     string `json:"sitekey,omitempty"`
+	IframeURL   string `json:"iframe_url,omitempty"`
+	Notes       string `json:"notes,omitempty"`
+	LLMSolvable bool   `json:"llm_solvable"`
+}