feat: native AWS Bedrock provider via Converse API

Salvaged from PR #7920 by JiaDe-Wu — cherry-picked Bedrock-specific
additions onto current main, skipping stale-branch reverts (293 commits
behind).

Dual-path architecture:
  - Claude models → AnthropicBedrock SDK (prompt caching, thinking budgets)
  - Non-Claude models → Converse API via boto3 (Nova, DeepSeek, Llama, Mistral)

Includes:
  - Core adapter (agent/bedrock_adapter.py, 1098 lines)
  - Full provider registration (auth, models, providers, config, runtime, main)
  - IAM credential chain + Bedrock API Key auth modes
  - Dynamic model discovery via ListFoundationModels + ListInferenceProfiles
  - Streaming with delta callbacks, error classification, guardrails
  - hermes doctor + hermes auth integration
  - /usage pricing for 7 Bedrock models
  - 130 automated tests (79 unit + 28 integration + follow-up fixes)
  - Documentation (website/docs/guides/aws-bedrock.md)
  - boto3 optional dependency (pip install hermes-agent[bedrock])

Co-authored-by: JiaDe WU <40445668+JiaDe-Wu@users.noreply.github.com>

hermes_cli/config.py

@@ -419,6 +419,27 @@ DEFAULT_CONFIG = {
         "protect_last_n": 20,         # minimum recent messages to keep uncompressed
 
     },
+
+    # AWS Bedrock provider configuration.
+    # Only used when model.provider is "bedrock".
+    "bedrock": {
+        "region": "",  # AWS region for Bedrock API calls (empty = AWS_REGION env var → us-east-1)
+        "discovery": {
+            "enabled": True,           # Auto-discover models via ListFoundationModels
+            "provider_filter": [],     # Only show models from these providers (e.g. ["anthropic", "amazon"])
+            "refresh_interval": 3600,  # Cache discovery results for this many seconds
+        },
+        "guardrail": {
+            # Amazon Bedrock Guardrails — content filtering and safety policies.
+            # Create a guardrail in the Bedrock console, then set the ID and version here.
+            # See: https://docs.aws.amazon.com/bedrock/latest/userguide/guardrails.html
+            "guardrail_identifier": "",  # e.g. "abc123def456"
+            "guardrail_version": "",     # e.g. "1" or "DRAFT"
+            "stream_processing_mode": "async",  # "sync" or "async"
+            "trace": "disabled",         # "enabled", "disabled", or "enabled_full"
+        },
+    },
+
     "smart_model_routing": {
         "enabled": False,
         "max_simple_chars": 160,
@@ -974,6 +995,22 @@ OPTIONAL_ENV_VARS = {
         "category": "provider",
         "advanced": True,
     },
+    "AWS_REGION": {
+        "description": "AWS region for Bedrock API calls (e.g. us-east-1, eu-central-1)",
+        "prompt": "AWS Region",
+        "url": "https://docs.aws.amazon.com/bedrock/latest/userguide/bedrock-regions.html",
+        "password": False,
+        "category": "provider",
+        "advanced": True,
+    },
+    "AWS_PROFILE": {
+        "description": "AWS named profile for Bedrock authentication (from ~/.aws/credentials)",
+        "prompt": "AWS Profile",
+        "url": None,
+        "password": False,
+        "category": "provider",
+        "advanced": True,
+    },
 
     # ── Tool API keys ──
     "EXA_API_KEY": {