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772cfb6c4e
Four independent fixes: 1. Reset activity timestamp on cached agent reuse (#9051) When the gateway reuses a cached AIAgent for a new turn, the _last_activity_ts from the previous turn (possibly hours ago) carried over. The inactivity timeout handler immediately saw the agent as idle for hours and killed it. Fix: reset _last_activity_ts, _last_activity_desc, and _api_call_count when retrieving an agent from the cache. 2. Detect uv-managed virtual environments (#8620 sub-issue 1) The systemd unit generator fell back to sys.executable (uv's standalone Python) when running under 'uv run', because sys.prefix == sys.base_prefix. The generated ExecStart pointed to a Python binary without site-packages. Fix: check VIRTUAL_ENV env var before falling back to sys.executable. uv sets VIRTUAL_ENV even when sys.prefix doesn't reflect the venv. 3. Nudge model to continue after empty post-tool response (#9400) Weaker models sometimes return empty after tool calls. The agent silently abandoned the remaining work. Fix: append assistant('(empty)') + user nudge message and retry once. Resets after each successful tool round. 4. Compression model fallback on permanent errors (#8620 sub-issue 4) When the default summary model (gemini-3-flash) returns 503 'model_not_found' on custom proxies, the compressor entered a 600s cooldown, leaving context growing unbounded. Fix: detect permanent model-not-found errors (503, 404, 'model_not_found', 'no available channel') and fall back to using the main model for compression instead of entering cooldown. One-time fallback with immediate retry. Test plan: 40 compressor tests + 97 gateway/CLI tests + 9 venv tests pass