fix: correct context-length resolution for kimi-k2.6 on Ollama Cloud and Kimi Coding

Kimi-k2.6 (which supports 262K context) was incorrectly resolved as 32K,
tripping the 64K minimum-context guard and preventing use of the model on
Ollama Cloud and Kimi Coding / Moonshot providers.

Three fixes in the context-length resolution chain:

1. Ollama Cloud native /api/show query: new _query_ollama_api_show()
   queries the Ollama native API for authoritative GGUF model_info
   context_length.  For hosted Ollama, prefers model_info over num_ctx
   since users can't set their own num_ctx on Cloud.  Added at step 5e
   in get_model_context_length(), before the models.dev fallback.

2. models.dev :cloud/-cloud suffix fallback: lookup_models_dev_context()
   now also tries appending :cloud and -cloud suffixes when the bare
   model name doesn't match.  models.dev stores 'kimi-k2.6:cloud' but
   users and the live API use bare 'kimi-k2.6'.

3. Kimi-family 32K guard: after the OpenRouter metadata step, reject
   exactly 32768 for Kimi-named models (kimi-*, moonshot*) and fall
   through to hardcoded defaults ('kimi': 262144).  OpenRouter reports
   32768 for moonshotai/kimi-k2.6 but the model actually supports 262K.
   Narrow filter — only 32768, only Kimi-family — becomes dead code
   when OpenRouter updates its metadata.

---

agent/models_dev.py

@@ -347,6 +347,28 @@ def lookup_models_dev_context(provider: str, model: str) -> Optional[int]:
             if ctx:
                 return ctx
 
+    # Suffix-aware fallback: some providers (e.g. ollama-cloud) store
+    # model IDs with :cloud / -cloud suffixes in models.dev while the
+    # live API returns bare names.  Without this, kimi-k2.6 misses the
+    # kimi-k2.6:cloud entry and falls through to stale OpenRouter metadata
+    # reporting 32768 — tripping the 64k minimum-context guard.
+    # The suffix-stripping in fetch_ollama_cloud_models() handles the
+    # model-picker UX; this handles the context-length lookup path.
+    for suffix in (":cloud", "-cloud"):
+        suffixed_key = model + suffix
+        entry = models.get(suffixed_key)
+        if entry:
+            ctx = _extract_context(entry)
+            if ctx:
+                return ctx
+        # Also try case-insensitive
+        suffixed_lower = model_lower + suffix
+        for mid, mdata in models.items():
+            if mid.lower() == suffixed_lower:
+                ctx = _extract_context(mdata)
+                if ctx:
+                    return ctx
+
     return None