feat(models): add Claude Opus 4.8

[Couiz]

Summary

Adds Claude Opus 4.8 across all four layers Hermes uses to know an Anthropic model.

• hermes_cli/models.py — adds the model to OPENROUTER_MODELS (anthropic/claude-opus-4.8), _PROVIDER_MODELS["nous"], and the native _PROVIDER_MODELS["anthropic"] list (claude-opus-4-8).
• agent/model_metadata.py — 1M context window for both claude-opus-4-8 and claude-opus-4.8, inserted before the 4.7 entries to avoid fuzzy-match collisions.
• agent/anthropic_adapter.py — adds 4-8/4.8 to the substring gates so Opus 4.8 inherits the Opus 4.7 contract:
  • _XHIGH_EFFORT_SUBSTRINGS → xhigh adaptive effort (not downgraded to max)
  • _ADAPTIVE_THINKING_SUBSTRINGS → adaptive thinking
  • _NO_SAMPLING_PARAMS_SUBSTRINGS → omits temperature/top_p/top_k (4.7+ returns 400 otherwise)
  • _ANTHROPIC_OUTPUT_LIMITS["claude-opus-4-8"] = 128_000
• website/static/api/model-catalog.json — regenerated via scripts/build_model_catalog.py to keep the published manifest in sync with the curated lists.

Verification

• Model ID confirmed live against the Anthropic API (GET /v1/models returns claude-opus-4-8, no dated suffix — same shape as claude-opus-4-7).
• Adapter gates assert xhigh=True, adaptive=True, no-sampling=True for claude-opus-4-8, claude-opus-4.8, and anthropic/claude-opus-4.8.
• Fuzzy-collision sanity: '4-8' in 'claude-opus-4-7' is False.

Test Plan

• pytest tests/agent/test_anthropic_adapter.py tests/hermes_cli/test_models.py tests/hermes_cli/test_model_catalog.py tests/hermes_cli/test_model_validation.py → 334 passed
• Manifest sync test (test_in_repo_lists_match_manifest) passes after regeneration

[Couiz]

Closing as superseded — #34003 ("feat: add claude-opus-4.8 and claude-opus-4.8-fast") landed on main first and covers everything here: identical adapter substring gates (_XHIGH_EFFORT_SUBSTRINGS, _ADAPTIVE_THINKING_SUBSTRINGS, _NO_SAMPLING_PARAMS_SUBSTRINGS), the 1M DEFAULT_CONTEXT_LENGTHS entries, the 128k output limit, and the curated model lists — plus the claude-opus-4.8-fast variant this PR didn't include. Nothing to add. Thanks!