EnvironmentConfigLoader protocol missing from consumer-profiles.md protocol list

[codeforester]

Problem

docs/consumer-profiles.md lists the exported typed protocols that consumers can implement to customise the framework. However, it omits EnvironmentConfigLoader, which IS exported from base_cli (confirmed in __init__.py and profile.py).

EnvironmentConfigLoader is the protocol for the load_config_for_environment field on CliProfile — the hook that allows environment-aware configuration loading (--environment staging maps to a different config file or set of values). A consumer who wants to implement environment-aware config loading needs to know this protocol exists and what its signature is.

Fix

Add EnvironmentConfigLoader to the protocol listing in docs/consumer-profiles.md, with:

• Its signature: (project: ProjectInfo | None, config_path: Path | None, environment: str) -> dict | ConfigSnapshot
• When to implement it (env-aware config files, per-environment secrets, environment validation)
• A minimal example

Verify the full list against base_cli.__all__ to ensure no other protocols are missing.