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* feat: support string login in build_config and add substitute_mapping_values (#61, #62) Extend build_config() to accept login: int | str | None. String logins are coerced via the existing coerce_login() helper (empty/whitespace → None, numeric strings → int, non-numeric → ValueError). When allow_whole_dollar_env=True, ${ENV} and $ENV placeholders are expanded before coercion, consistent with path/password/server behavior. Add substitute_mapping_values(), a generic recursive helper that substitutes environment placeholders in nested dicts/lists only for caller-selected mapping keys. Non-selected fields (including literal dollar signs) are preserved exactly. Supports blank_string_keys_as_none to normalise empty strings to None after substitution. No application- specific key names (e.g. mt5_login) are hard-coded in mt5cli. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * Bump version to v0.9.5 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * docs+test: clarify substitute_mapping_values docstring and pin tuple behaviour - Adds sentence noting list-element strings are never substituted (only immediate dict values are), addressing reviewer finding #1. - Rewrites Returns section to accurately describe scalar pass-through behaviour, addressing reviewer finding #2. - Adds recursion-depth caveat to the generic-utility docstring, addressing reviewer finding #4. - Adds test_tuple_container_not_traversed to pin the existing silent tuple-exclusion contract, addressing reviewer finding #3. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * docs: update public contract and README for build_config login coercion and substitute_mapping_values - Expands build_config row to document login: int | str | None, numeric-string coercion, blank-string handling, and env placeholder expansion when allow_whole_dollar_env=True. - Adds substitute_mapping_values to the stable SDK table with a note that key names are never hard-coded in mt5cli. - Extends allow_whole_dollar_env paragraph to list substitute_mapping_values. - README: adds build_config env-placeholder example and imports to the trading lifecycle snippet. - README: extends credential-resolution bullet with a substitute_mapping_values usage example using generic key names. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> --------- Co-authored-by: agent <agent@localhost> Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>