feat(minimax-oauth): full integration with peer OAuth providers

Close integration gaps discovered by auditing qwen-oauth's file coverage.
These are surfaces the original salvage missed — they all existed on
main and were added in the 747 commits since PR #15203 was opened.

Coverage added:
- agent/credential_pool.py: seed pool from auth.json providers.minimax-oauth
  so `hermes auth list` reflects logged-in state and
  `hermes auth remove minimax-oauth <N>` works through the standard flow.
- agent/credential_sources.py: register RemovalStep for minimax-oauth
  with suppression-aware `_clear_auth_store_provider`.
- agent/models_dev.py: PROVIDER_TO_MODELS_DEV mapping (-> 'minimax' family).
- hermes_cli/providers.py: HermesOverlay entry (anthropic_messages transport,
  oauth_external auth_type, api.minimax.io/anthropic base).
- hermes_cli/model_normalize.py: add to _MATCHING_PREFIX_STRIP_PROVIDERS so
  `minimax-oauth/MiniMax-M2.7` in config.yaml gets correctly repaired.
- hermes_cli/status.py: render MiniMax OAuth block in `hermes doctor`
  (logged-in / region / expires_at / error).
- hermes_cli/web_server.py: register in OAUTH_PROVIDER_REGISTRY + dispatch
  branch in _resolve_provider_status so the dashboard auth page shows it.
- website/docs/integrations/providers.md: full 'MiniMax (OAuth)' section.
- website/docs/reference/cli-commands.md: --provider enum.
- website/docs/user-guide/features/fallback-providers.md: fallback table row.
- scripts/release.py AUTHOR_MAP: amanning3390 mapping (CI gate).

agent/credential_pool.py

@@ -1299,6 +1299,48 @@ def _seed_from_singletons(provider: str, entries: List[PooledCredential]) -> Tup
         except Exception as exc:
             logger.debug("Qwen OAuth token seed failed: %s", exc)
 
+    elif provider == "minimax-oauth":
+        # MiniMax OAuth tokens live in ~/.hermes/auth.json providers.minimax-oauth.
+        # Seed the pool so `/auth list` reflects the logged-in state and the
+        # standard `hermes auth remove minimax-oauth <N>` flow works.
+        # Use refresh_if_expiring=False equivalent: resolve_minimax_oauth_runtime_credentials
+        # always refreshes on expiry, so instead read raw state here to avoid
+        # surprise network calls during provider discovery.
+        try:
+            from hermes_cli.auth import get_provider_auth_state
+            state = get_provider_auth_state("minimax-oauth")
+            if state and state.get("access_token"):
+                source_name = "oauth"
+                if not _is_suppressed(provider, source_name):
+                    active_sources.add(source_name)
+                    expires_at_ms = None
+                    try:
+                        from datetime import datetime as _dt
+                        raw = state.get("expires_at", "")
+                        if raw:
+                            expires_at_ms = int(_dt.fromisoformat(raw).timestamp() * 1000)
+                    except Exception:
+                        expires_at_ms = None
+                    base_url = str(state.get("inference_base_url", "") or "").rstrip("/")
+                    changed |= _upsert_entry(
+                        entries,
+                        provider,
+                        source_name,
+                        {
+                            "source": source_name,
+                            "auth_type": AUTH_TYPE_OAUTH,
+                            "access_token": state["access_token"],
+                            "refresh_token": state.get("refresh_token"),
+                            "expires_at_ms": expires_at_ms,
+                            "base_url": base_url,
+                            "label": state.get("label", "") or label_from_token(
+                                state.get("access_token", ""), source_name
+                            ),
+                        },
+                    )
+        except Exception as exc:
+            logger.debug("MiniMax OAuth token seed failed: %s", exc)
+
     elif provider == "openai-codex":
         # Respect user suppression — `hermes auth remove openai-codex` marks
         # the device_code source as suppressed so it won't be re-seeded from

agent/credential_sources.py

@@ -252,6 +252,19 @@ def _remove_nous_device_code(provider: str, removed) -> RemovalResult:
     return result
 
 
+def _remove_minimax_oauth(provider: str, removed) -> RemovalResult:
+    """MiniMax OAuth lives in auth.json providers.minimax-oauth — clear it.
+
+    Same pattern as Nous: single-source OAuth state with refresh tokens.
+    Suppression of the `oauth` source ensures the pool reseed path
+    (_seed_from_singletons) doesn't instantly undo the removal.
+    """
+    result = RemovalResult()
+    if _clear_auth_store_provider(provider):
+        result.cleaned.append(f"Cleared {provider} OAuth tokens from auth store")
+    return result
+
+
 def _remove_codex_device_code(provider: str, removed) -> RemovalResult:
     """Codex tokens live in TWO places: our auth store AND ~/.codex/auth.json.
 
@@ -389,6 +402,11 @@ def _register_all_sources() -> None:
         remove_fn=_remove_qwen_cli,
         description="~/.qwen/oauth_creds.json",
     ))
+    register(RemovalStep(
+        provider="minimax-oauth", source_id="oauth",
+        remove_fn=_remove_minimax_oauth,
+        description="auth.json providers.minimax-oauth",
+    ))
     register(RemovalStep(
         provider="*", source_id="config:",
         match_fn=lambda src: src.startswith("config:") or src == "model_config",

agent/models_dev.py

@@ -149,6 +149,7 @@ PROVIDER_TO_MODELS_DEV: Dict[str, str] = {
     "stepfun": "stepfun",
     "kimi-coding-cn": "kimi-for-coding",
     "minimax": "minimax",
+    "minimax-oauth": "minimax",
     "minimax-cn": "minimax-cn",
     "deepseek": "deepseek",
     "alibaba": "alibaba",