chore: release v0.3.1

- correctness/stability patch: look-ahead filter, router crash-safety, checkpoint
  identity, crypto sentiment sources, configurable retries, Bedrock API-key auth
- adds Claude Sonnet 5 / Fable 5 support

.env.example

@@ -25,8 +25,10 @@ NVIDIA_API_KEY=
 #OPENAI_COMPATIBLE_API_KEY=
 
 # AWS Bedrock (provider "bedrock", install with: pip install ".[bedrock]").
-# Auth uses the standard AWS credential chain; set the region (and optionally a
-# named profile). No single API key.
+# Auth: either a Bedrock API key (bearer token, no AWS access keys) OR the AWS
+# credential chain (env keys / ~/.aws/credentials / IAM role / AWS_PROFILE). Set
+# the region either way; a bearer token takes precedence when both are present.
+#AWS_BEARER_TOKEN_BEDROCK=
 #AWS_DEFAULT_REGION=us-west-2
 #AWS_PROFILE=
 
@@ -55,6 +57,10 @@ NVIDIA_API_KEY=
 # honor it). Unset leaves each provider at its default. See the README
 # "Reproducibility" note — no setting makes LLM output fully deterministic.
 #TRADINGAGENTS_TEMPERATURE=0.0
+# LLM SDK retry budget forwarded to every provider. Unset leaves each SDK at its
+# own default (usually 2). Raise it to ride out bursty 429 rate-limit throttling
+# on rate-limited deployments (e.g. Azure OpenAI) instead of aborting the run.
+#TRADINGAGENTS_LLM_MAX_RETRIES=6
 # Provider-specific reasoning/thinking depth (optional; unset = provider
 # default). Setting one also skips the matching interactive prompt.
 #TRADINGAGENTS_OPENAI_REASONING_EFFORT=medium