diff --git a/.claude/worktrees/agent-a1140340 b/.claude/worktrees/agent-a1140340
new file mode 160000
index 0000000..692e6f9
--- /dev/null
+++ b/.claude/worktrees/agent-a1140340
@@ -0,0 +1 @@
+Subproject commit 692e6f937856ace638d9773c17f7447ca439d881
diff --git a/.claude/worktrees/agent-a88ce9b7 b/.claude/worktrees/agent-a88ce9b7
new file mode 160000
index 0000000..a60db21
--- /dev/null
+++ b/.claude/worktrees/agent-a88ce9b7
@@ -0,0 +1 @@
+Subproject commit a60db217827213e019a15bca7c0ab05a5b183275
diff --git a/.claude/worktrees/agent-aa5d905d b/.claude/worktrees/agent-aa5d905d
new file mode 160000
index 0000000..9bd8701
--- /dev/null
+++ b/.claude/worktrees/agent-aa5d905d
@@ -0,0 +1 @@
+Subproject commit 9bd8701a1d38e3fdb1823bb936b260d7ec0fe165
diff --git a/backend/mailer.py b/backend/mailer.py
index e5cbdc0..b47fd5d 100644
--- a/backend/mailer.py
+++ b/backend/mailer.py
@@ -50,7 +50,6 @@ async def _send_brevo(to: str, subject: str, html: str, plain: str):
         "subject":      subject,
         "htmlContent":  html,
         "textContent":  plain,
-        "headers":      {"X-Mailin-Track-Click": "0", "X-Mailin-Track-Opens": "0"},
     }
     async with httpx.AsyncClient(timeout=15) as client:
         resp = await client.post(