feat: align CLI/UI workflow and reusable analysis payloads

[rad1092]

Motivation

• Align the CLI behavior with the beginner README so newcomers can follow the guide end-to-end using bitnet-analyze.
• Make prompt and payload generation reusable between CLI and the web UI to avoid duplication and support inline CSV from the UI.
• Fix package exports to prevent import-time errors when tests or consumers import bitnet_tools.

Description

• Add analyze and ui subcommands in bitnet_tools.cli, provide _build_parser and main(argv: ...), and auto-route legacy bare-CSV invocations into the analyze subcommand.
• Factor prompt construction into build_prompt(summary, question) and add build_analysis_payload_from_csv_text to bitnet_tools.analysis to support inline CSV analysis for the UI.
• Update bitnet_tools.__init__ to export the actual public functions (build_analysis_payload, build_analysis_payload_from_csv_text, build_prompt, summarize_rows).
• Update the README quick-run block to include project install, bitnet-analyze analyze ... and bitnet-analyze ui ... commands and add tests in tests/test_cli.py while extending tests/test_analysis.py.

Testing

• pytest -q initially failed during collection because the package was not importable in the environment without setting PYTHONPATH and pip install -e . failed due to blocked external index access when resolving build dependencies.
• Ran PYTHONPATH=. pytest -q and all tests passed (5 passed).
• Verified the CLI help with PYTHONPATH=. python -m bitnet_tools.cli --help, which succeeded.

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[chatgpt-codex-connector]

Add sample CSV creation before analyze command

The new quick-start command block now calls bitnet-analyze analyze sample.csv ... without creating or pointing to an existing sample.csv, so users following section 6 verbatim will hit FileNotFoundError instead of completing the advertised “minimum commands” flow. This regresses the onboarding path introduced by this commit; please add a prior step that creates a sample CSV (or reference a concrete existing file path).

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