chore: remove hardcoded assignee from issue templates (homeassistant-ai#800)

New issues filed via the startup bug, runtime bug, and agent behavior
templates were automatically assigned to julienld. Removing the
assignees field so issues start unassigned.

Author: sergeykad

.github/ISSUE_TEMPLATE/agent_behavior.yml

@@ -2,9 +2,6 @@ name: "🤖 AI Agent Behavior Feedback"
 description: "Report AI agent inefficiency, wrong tool usage, or suggest workflow improvements"
 title: "[AGENT] "
 labels: ["agent-behavior"]
-assignees:
-  - julienld
-
 body:
   - type: markdown
     attributes:

.github/ISSUE_TEMPLATE/runtime_bug.yml

@@ -2,9 +2,6 @@ name: "🐛 Runtime Bug"
 description: "Report a bug that occurs while ha-mcp is running (errors, crashes, incorrect behavior)"
 title: "[BUG] "
 labels: ["bug"]
-assignees:
-  - julienld
-
 body:
   - type: markdown
     attributes:

.github/ISSUE_TEMPLATE/startup_bug.yml

@@ -2,9 +2,6 @@ name: "🚀 Startup/Installation Bug"
 description: "Report a bug preventing ha-mcp from starting, installing, or connecting"
 title: "[BUG] "
 labels: ["bug", "startup"]
-assignees:
-  - julienld
-
 body:
   - type: markdown
     attributes:

src/ha_mcp/__main__.py

@@ -573,7 +573,7 @@ async def _run_http_with_graceful_shutdown(
 _registered_landing_paths: set[str] = set()
 
 
-def register_browser_landing(mcp_instance: "FastMCP", path: str) -> None:
+def register_browser_landing(mcp_instance: "FastMCP | _DeferredMCP", path: str) -> None:
     """Register a GET handler that returns 405 with a helpful message.
 
     Browsers and misconfigured clients that send GET instead of POST will see