feat(connectors): /api/connectors/call — proxy a connector tool call (pre-chat)

Adds /api/connectors/call -> connectd /mcp/call, so the app can invoke a connector tool (e.g. WhatsApp
get_pairing_qr / get_login_status for the pairing UI) through the soul, keeping app->soul->connectd
intact (UI never hits connectd directly) and working for future remote/hosted clients. elc-clean.
NOTE: soul-core change — needs dist/soul.c regen (Will), can ride the same rebuild as PR #56.

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

chat.el

@@ -1688,25 +1688,12 @@ fn handle_chat_agentic(body: String) -> String {
     let safe_msg: String = json_safe(message)
     let safe_sys: String = json_safe(system)
 
-    // Vision in the agentic brain (2026-06-27): when the client attaches an image
-    // (base64 in body "image", mime in "image_media_type"), send it as a real Anthropic
-    // image content block on THIS user turn — so the model sees raw pixels WITH memory,
-    // history, and tools (parity with the CLI). img_b64 == "" => byte-identical to before.
-    let img_b64: String = json_get(body, "image")
-    let img_mt_raw: String = json_get(body, "image_media_type")
-    let img_mt: String = if str_eq(img_mt_raw, "") { "image/png" } else { img_mt_raw }
-    let cur_user_content: String = if str_eq(img_b64, "") {
-        "\"" + safe_msg + "\""
-    } else {
-        "[{\"type\":\"text\",\"text\":\"" + safe_msg + "\"},{\"type\":\"image\",\"source\":{\"type\":\"base64\",\"media_type\":\"" + img_mt + "\",\"data\":\"" + img_b64 + "\"}}]"
-    }
-
     // Seed the messages array with recent history if available, so the LLM sees the thread.
     let prior_messages: String = if agentic_hist_len > 0 {
         let inner: String = str_slice(agentic_hist, 1, str_len(agentic_hist) - 1)
-        "[" + inner + ",{\"role\":\"user\",\"content\":" + cur_user_content + "}]"
+        "[" + inner + ",{\"role\":\"user\",\"content\":\"" + safe_msg + "\"}]"
     } else {
-        "[{\"role\":\"user\",\"content\":" + cur_user_content + "}]"
+        "[{\"role\":\"user\",\"content\":\"" + safe_msg + "\"}]"
     }
     let messages: String = prior_messages
     let api_url: String = "https://api.anthropic.com/v1/messages"

routes.el

@@ -335,6 +335,12 @@ fn handle_connectors(method: String, clean: String, body: String) -> String {
     if str_eq(clean, "/api/connectors/oauth/start") {
         return connectd_post("/mcp/oauth/start", body)
     }
+    // Call a connector tool directly (pre-chat), e.g. WhatsApp get_pairing_qr / get_login_status for
+    // the pairing UI. Body: {"name":"mcp__<server>__<tool>","input":{...}}. Keeps the app on the
+    // app->soul->connectd path (the UI never hits connectd directly) and works for remote/hosted apps.
+    if str_eq(clean, "/api/connectors/call") {
+        return connectd_post("/mcp/call", body)
+    }
     return "{\"ok\":false,\"error\":\"unknown connectors route\"}"
 }