fix: /stop now immediately aborts streaming retry loop

When a user sends /stop during a streaming API call, the outer poll loop
detects _interrupt_requested and closes the HTTP connection. However, the
inner _call() thread catches the connection error and enters its retry
loop — opening a FRESH connection without checking the interrupt flag.

On slow providers like ollama-cloud, each retry attempt blocks for the
full stream-read timeout (120s+). With 3 retry attempts this caused
510+ second delays between /stop and actual response — the agent appeared
completely unresponsive despite the stop being acknowledged.

Fix: add an _interrupt_requested check at the top of the streaming retry
loop so the agent exits immediately instead of retrying.

Also fix log truncation: all session key logging in gateway/run.py used
[:20] or [:30] slices, which truncated 'agent:main:telegram:dm:5690190437'
(33 chars) to 'agent:main:telegram:' — losing the identifying chat type
and user ID. Replace with full keys to make logs debuggable.

Reported by user Sidharth Pulipaka via Telegram on ollama-cloud provider.

run_agent.py

@@ -5141,6 +5141,8 @@ class AIAgent:
         # response.incomplete instead of response.completed).
         self._codex_streamed_text_parts: list = []
         for attempt in range(max_stream_retries + 1):
+            if self._interrupt_requested:
+                raise InterruptedError("Agent interrupted before Codex stream retry")
             collected_output_items: list = []
             try:
                 with active_client.responses.stream(**api_kwargs) as stream:
@@ -6310,6 +6312,14 @@ class AIAgent:
 
             try:
                 for _stream_attempt in range(_max_stream_retries + 1):
+                    # Check for interrupt before each retry attempt.  Without
+                    # this, /stop closes the HTTP connection (outer poll loop),
+                    # but the retry loop opens a FRESH connection — negating the
+                    # interrupt entirely.  On slow providers (ollama-cloud) each
+                    # retry can block for the full stream-read timeout (120s+),
+                    # causing multi-minute delays between /stop and response.
+                    if self._interrupt_requested:
+                        raise InterruptedError("Agent interrupted before stream retry")
                     try:
                         if self.api_mode == "anthropic_messages":
                             self._try_refresh_anthropic_client_credentials()