[WIP] new_pipeline and possibly other entry points do not load the .env file via dotenv with load_dotenv

[Copilot]

Plan to fix the issue where new_pipeline.py and other entry points do not load the .env file via dotenv.load_dotenv().

Problem Analysis:

• The error occurs because new_pipeline.py doesn't call load_dotenv() before calling get_agent_config()
• While parse_raw.py and gen_outline_layout_parallel.py already call load_dotenv(), new_pipeline.py and poster_gen_pipeline.py do not
• The error "KeyError: 'model_platform'" occurs when get_agent_config() returns an incomplete configuration
• The user used model name "o4-mini" but the valid option is "4o-mini"

Plan:

• Analyze the codebase to identify entry points missing load_dotenv() calls
• Add load_dotenv() import and call to new_pipeline.py
• Add load_dotenv() import and call to poster_gen_pipeline.py
• Check other entry point files for the same issue
• Test the fix to ensure environment variables are properly loaded
• Verify minimal changes scope

Fixes #1.

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