feat: add _sanitize_mentions helper and apply to comment/reply truncation

Introduce a new `_sanitize_mentions` method in `BotHelpersMixin` that deduplicates and removes self-mentions from text, using a compiled regex for `@handle` patterns. Apply this sanitizer before the 2000-character truncation in both `engage.py` comment posting and `social.py` reply posting to prevent duplicate or self-referential mentions from being cut off mid-handle. Additionally, fix profile URL parsing in `social.py` to strip trailing path segments, and refine `LLMClient.clean` to handle asterisks and underscores more precisely without breaking adjacent alphanumeric characters.

devplacepy/services/bot/social.py

@@ -28,7 +28,7 @@ class BotSocialMixin:
                 try:
                     await links.nth(i).click(timeout=5000)
                     await b._idle(1.0, 2.0)
-                    uname = h.split("/profile/")[-1].split("?")[0]
+                    uname = h.split("/profile/")[-1].split("?")[0].split("/")[0]
                     if uname not in self.state.known_users:
                         self.state.known_users.append(uname)
                     self.state.profiles_viewed += 1
@@ -446,6 +446,9 @@ class BotSocialMixin:
                         )
             except Exception:
                 mentioner = ""
+            if mentioner and mentioner.lower() == self.state.username.lower():
+                self._log("Mention target resolves to self, skipping")
+                return False
             try:
                 await comment_loc.scroll_into_view_if_needed(timeout=2000)
                 await b._idle(0.3, 0.9)
@@ -485,7 +488,7 @@ class BotSocialMixin:
             return False
         if mentioner and f"@{mentioner.lower()}" not in reply.lower():
             reply = f"@{mentioner} {reply}"
-        reply = reply[:2000]
+        reply = self._sanitize_mentions(reply)[:2000]
         textarea_sels = [
             ".comment .reply-form textarea[name='content']",
             ".reply-form textarea[name='content']",