- Add DownloadApi class (inherits RenderApi for backward compat), AuditFeesApi,
  EdgarIndexApi, and 3 new FormAdvApi methods (get_other_business_names, get_separately_managed_accounts, get_financial_industry_affiliations)
- Update Download API endpoint from archive.sec-api.io to edgar-mirror.sec-api.io
- Add integration test suite (40 tests) covering all API classes
- Add collapsible response examples to all README sections with full example
  response links, matching the NPM package structure
- Split Form ADV, Insider Trading (Form 3/4/5), and Form N-PX into sub-sections
- Add Bulk Datasets section, Quick Start code, and complete TOC with verified links
- Add examples/api-responses/ with JSON response files for all APIs

- Add Datasets class with get_all(), get_dataset_details(), show_all(),
  show_dataset_details(), download(), and sync() methods
- Downloads are atomic (.tmp + rename) with incremental sync support —
  only new or updated containers are re-downloaded based on file size
- Helpful error on misspelled dataset names listing all available datasets
- Add DownloadApi class (alias for RenderApi, backward compatible)
- Update filing download endpoint to edgar-mirror.sec-api.io
- Add Quick Start section, Bulk Datasets docs with download/sync examples
- Add tests for Datasets, DownloadApi (42 tests total)

- Update README banner and entity/filing descriptions
- Move examples.py to examples/scripts/
- Update GitHub project URLs to sec-api-io org