feat(models): add anthropic/claude-opus-5 to OpenRouter and Nous Portal catalogs

Anthropic released Claude Opus 5 (+ -fast variant) — both are live on
OpenRouter and the Nous Portal /models endpoint (verified against both
live APIs). Opus 4.8 entries are kept.

- hermes_cli/models.py: opus-5 + opus-5-fast in OPENROUTER_MODELS;
  opus-5 in _PROVIDER_MODELS[nous] (Portal serves both, curated list
  carries the base model like the rest of the Nous Anthropic block).
  Ordering: below fable-5 flagship, above opus-4.8.
- agent/model_metadata.py: claude-opus-5 -> 1M context (matches live
  OpenRouter metadata).
- agent/reasoning_timeouts.py: claude-opus-5 -> 240s stale-timeout
  floor (same as the opus-4.x thinking family).
- website/static/api/model-catalog.json: regenerated via
  scripts/build_model_catalog.py.

Both providers bill via official_models_api (live pricing), so no
_OFFICIAL_DOCS_PRICING snapshot entry is needed for these routes.

hermes_cli/models.py

@@ -41,6 +41,8 @@ def _urlopen_model_catalog_request(req: urllib.request.Request, *, timeout: floa
 OPENROUTER_MODELS: list[tuple[str, str]] = [
     # Anthropic
     ("anthropic/claude-fable-5",               ""),
+    ("anthropic/claude-opus-5",                ""),
+    ("anthropic/claude-opus-5-fast",           "2x price, higher output speed"),
     ("anthropic/claude-opus-4.8",              ""),
     ("anthropic/claude-opus-4.8-fast",         "2x price, higher output speed"),
     ("anthropic/claude-sonnet-5",              ""),
@@ -192,6 +194,7 @@ _PROVIDER_MODELS: dict[str, list[str]] = {
     "nous": [
         # Anthropic
         "anthropic/claude-fable-5",
+        "anthropic/claude-opus-5",
         "anthropic/claude-opus-4.8",
         "anthropic/claude-sonnet-5",
         "anthropic/claude-haiku-4.5",