v3.11.0: merge cobra PR, smart-continue, hot-reload, XML extraction

- Merge PR #5 from cobra91: concurrency semaphore, auto-continue, SO_REUSEADDR,
  proxy-stderr.log, stream diagnostics, timeout handler, restart proxy fix
- Tool call argument normalizer, smart-continue loop, XML extraction
- API key hot-reload with mtime tracking + /admin/ endpoints
- GUI hot-reload on endpoint edit with upstream verification
- Synthetic tool-results disabled (caused deepseek-v4-pro truncation)
- Version bump 3.10.12 -> 3.11.0, rebuild .deb

CHANGELOG.md

@@ -1,5 +1,25 @@
 # Changelog
 
+## v3.11.0 (2026-05-26)
+
+**Cobra PR Merge + Smart Continuation + API Key Hot-Reload**
+
+### New Features
+- **Concurrency semaphore (max 3)**: limits parallel upstream requests to prevent rate-limiting
+- **Auto-continue for truncated text**: detects text ending in `:`, `(`, `;`, `…` or `finish_reason=length`, continues seamlessly
+- **SO_REUSEADDR on sticky port**: prevents `TIME_WAIT` from changing port on restart
+- **proxy-stderr.log**: persistent log file for proxy errors
+- **Stream diagnostics**: logs event count, finish reason, content flag, elapsed time after each stream
+- **Timeout/OSError handler**: sends proper `response.failed` SSE event instead of silently dropping connection
+- **Restart Proxy button**: now only restarts proxy without killing Codex Desktop
+- **Tool call argument normalizer**: fixes capital-A `Arguments` key, strips markdown/JSON code block wrapping from tool call arguments
+- **Smart-continue loop (2× retries)**: escalating nudge messages when model returns text-only stop mid-task
+- **XML tool call extraction**: parses `<tool_call>name{args}</tool_call>` from model text output, injects as real `function_call` items
+- **Auto-continue + smart-continue ordered with skip guard**: prevents both from double-firing on the same response
+- **API key hot-reload**: mtime tracking detects config changes, `/admin/reload` endpoint triggers hot-reload, `/admin/verify-key` tests key against upstream
+- **GUI hot-reload**: auto-refreshes proxy key on endpoint edit, verifies with upstream — no proxy restart needed
+- **Synthetic tool-results disabled**: was causing deepseek-v4-pro truncation on opencode.ai
+
 ## v3.10.12 (2026-05-26)
 
 **Sticky Endpoint, Claude Fixes, Guardrail Skip, Anti-Stall**