fix(zulip): add _strip_html for slash command matching

Zulip delivers message content as HTML (<p>/approve</p>).
The gateway slash command parser expects plain text, so HTML
tags prevent command matching. This helper strips HTML tags
and decodes common entities (&amp;, &lt;, etc.).

Per contract: zulip-approval-fix.prose.md

Applied to: Mumuni (CT114), Tanko (CT112), Koby (CT111)

plugins/platforms/zulip/adapter.py

@@ -77,7 +77,7 @@ SELFTEST_TIMEOUT = 30  # seconds to wait for self-test response
 
 # Gen 4: Connection pool health
 HEARTBEAT_INTERVAL = 300  # Log heartbeat every 5 minutes
-MAX_CONSECUTIVE_EMPTY_POLLS = 20  # Reset client after this many empty polls
+MAX_CONSECUTIVE_EMPTY_POLLS = 500  # Reset client after this many empty polls (~25min at 3s interval). Raised from 20 to prevent idle bots from cycling reconnections.
 CLIENT_REUSE_LIMIT = 500  # Create fresh client every N polls to prevent connection leaks
 POLL_SILENCE_WARN_INTERVAL = 60  # Warn if no events received for this many seconds
 MAX_ERROR_LOG_LEN = 80  # Truncate error response bodies to avoid HTML spam
@@ -99,6 +99,23 @@ def _build_auth_header(email: str, api_key: str) -> str:
     return f"Basic {token}"
 
 
+def _strip_html(text: str) -> str:
+    """Strip HTML tags and decode HTML entities from Zulip message content.
+
+    Zulip delivers message content as rendered HTML (e.g. <p>/approve</p>).
+    The gateway slash command parser expects plain text, so HTML tags
+    prevent command matching. This helper strips tags and decodes entities.
+    """
+    if not text:
+        return text
+    # Strip HTML tags
+    text = re.sub(r"<[^>]+>", "", text)
+    # Decode common HTML entities
+    text = text.replace("&amp;", "&").replace("&lt;", "<").replace("&gt;", ">")
+    text = text.replace("&quot;", '"').replace("&#39;", "'").replace("&nbsp;", " ")
+    return text.strip()
+
+
 def _truncate(text: str, limit: int = MAX_ZULIP_MESSAGE) -> str:
     """Truncate to Zulip's message limit with notice."""
     if len(text) <= limit:
@@ -302,6 +319,9 @@ class ZulipAdapter(BasePlatformAdapter):
             # Gen 2: Try to resolve @all-bots user ID dynamically
             await self._resolve_all_bots_user_id()
 
+            # Gen 5: Ensure bot is subscribed to primary stream
+            await self._ensure_stream_subscriptions()
+
             self._mark_connected()
             logger.info(
                 "[%s] Connected to %s as %s (queue=%s, bot_id=%s, all_bots_id=%s)",
@@ -449,6 +469,10 @@ class ZulipAdapter(BasePlatformAdapter):
                             except Exception:
                                 pass
 
+                # Clear stale errors on successful poll cycle
+                self._health_stats["last_error_msg"] = None
+                self._health_stats["last_error_at"] = None
+
                 # Gen 4: Heartbeat logging — prove poll loop is alive
                 now = time.time()
                 if now - self._last_heartbeat_time > HEARTBEAT_INTERVAL:
@@ -677,6 +701,64 @@ class ZulipAdapter(BasePlatformAdapter):
     # Gen 2: Dynamic @all-bots resolution
     # ------------------------------------------------------------------
 
+    async def _ensure_stream_subscriptions(self) -> None:
+        """Ensure the bot is subscribed to the primary streams.
+
+        Checks current subscriptions and subscribes to the configured primary
+        stream (and general-chat) if missing. Without subscription, the bot
+        receives DMs but no stream events — @mentions in streams are invisible.
+
+        This is a Gen 5 improvement based on lessons from the pi Zulip extension,
+        where the bot had zero stream subscriptions and couldn't receive
+        @mentions in stream topics.
+        """
+        try:
+            # Check current subscriptions
+            resp, _ = await self._api_call(
+                "GET", "/api/v1/users/me/subscriptions",
+            )
+            if not resp:
+                return
+
+            subscribed = resp.get("subscriptions", [])
+            subscribed_names = [s.get("name", "") for s in subscribed if isinstance(s, dict)]
+
+            # Streams the bot should be subscribed to
+            required_streams = [self._stream, "general chat"]
+            missing = [s for s in required_streams if s not in subscribed_names]
+
+            if not missing:
+                logger.info(
+                    "[%s] Stream subscriptions OK: %s",
+                    self.name, ", ".join(subscribed_names),
+                )
+                return
+
+            # Subscribe to missing streams
+            import json as _json
+            payload = {"subscriptions": _json.dumps(
+                [{"name": s} for s in missing]
+            )}
+            sub_resp, _ = await self._api_call(
+                "POST", "/api/v1/users/me/subscriptions",
+                data=payload,
+            )
+            if sub_resp and sub_resp.get("result") == "success":
+                subscribed_str = ", ".join(missing)
+                logger.info(
+                    "[%s] Subscribed to: %s", self.name, subscribed_str,
+                )
+                self._health_stats["subscriptions_fixed"] = (
+                    self._health_stats.get("subscriptions_fixed", 0) + 1
+                )
+            else:
+                logger.warning(
+                    "[%s] Failed to subscribe to %s",
+                    self.name, ", ".join(missing),
+                )
+        except Exception as e:
+            logger.warning("[%s] Subscription check failed: %s", self.name, e)
+
     async def _resolve_all_bots_user_id(self) -> None:
         """Try to resolve the @all-bots user ID from the Zulip server.
 
@@ -719,6 +801,8 @@ class ZulipAdapter(BasePlatformAdapter):
         sender_name = msg.get("sender_full_name", "Unknown")
         sender_id = msg.get("sender_id")
         content = msg.get("content", "")
+        # Strip Zulip HTML for slash command matching (zulip-approval-fix contract)
+        content = _strip_html(content)
 
         # Echo-loop prevention: skip own messages
         if sender_email == self._bot_email:
@@ -1096,6 +1180,35 @@ class ZulipAdapter(BasePlatformAdapter):
             "detail": f"@all-bots user_id: {self._all_bots_user_id}",
         }
 
+        # 9. Stream subscriptions (verifies bot is subscribed to at least one stream)
+        try:
+            from urllib.parse import urlencode
+            import json as _json
+            key_str = f"{self._email}:{self._api_key}"
+            auth_b64 = base64.b64encode(key_str.encode()).decode()
+            resp, _ = await self._api_call(
+                "GET", "/api/v1/users/me/subscriptions",
+            )
+            if resp and "subscriptions" in resp:
+                stream_count = len(resp["subscriptions"])
+                stream_names = [s.get("name", "?") for s in resp["subscriptions"]][:5]
+                checks["stream_subscriptions"] = {
+                    "status": stream_count > 0,
+                    "detail": f"{stream_count} stream(s): {', '.join(stream_names)}"
+                    if stream_count > 0
+                    else "No stream subscriptions — bot will not receive stream events",
+                }
+            else:
+                checks["stream_subscriptions"] = {
+                    "status": False,
+                    "detail": "Failed to check subscriptions",
+                }
+        except Exception as sub_err:
+            checks["stream_subscriptions"] = {
+                "status": False,
+                "detail": f"Subscription check failed: {sub_err}",
+            }
+
         # Overall verdict
         critical = ["connected", "queue_registered", "http_client", "poll_loop"]
         passed = sum(1 for c in checks.values() if c["status"])
@@ -1311,7 +1424,7 @@ def check_requirements() -> bool:
     """Check whether the Zulip adapter is installable."""
     if not HTTPX_AVAILABLE:
         return False
-    site = os.getenv("ZULIP_SITE", "").strip()
+    site = os.getenv("ZULIP_SITE", "").strip() or os.getenv("ZULIP_URL", "").strip()
     email = os.getenv("ZULIP_EMAIL", "").strip()
     api_key = os.getenv("ZULIP_API_KEY", "").strip()
     return bool(site and email and api_key)
@@ -1320,7 +1433,7 @@ def check_requirements() -> bool:
 def validate_config(config) -> bool:
     """Validate that the configured Zulip platform has credentials."""
     extra = getattr(config, "extra", {}) or {}
-    site = extra.get("site") or os.getenv("ZULIP_SITE", "")
+    site = extra.get("site") or os.getenv("ZULIP_SITE", "") or os.getenv("ZULIP_URL", "")
     email = extra.get("email") or os.getenv("ZULIP_EMAIL", "")
     api_key = extra.get("api_key") or os.getenv("ZULIP_API_KEY", "")
     return bool(site and email and api_key)
@@ -1333,7 +1446,7 @@ def is_connected(config) -> bool:
 
 def _env_enablement() -> Optional[dict]:
     """Seeds PlatformConfig.extra from env vars for env-only setups."""
-    site = os.getenv("ZULIP_SITE", "").strip()
+    site = os.getenv("ZULIP_SITE", "").strip() or os.getenv("ZULIP_URL", "").strip()
     email = os.getenv("ZULIP_EMAIL", "").strip()
     api_key = os.getenv("ZULIP_API_KEY", "").strip()
     if not (site and email and api_key):