Harden investment research skills from community feedback

[UniC333]

What changed

• make multi-agent workflows client-neutral with parallel, wave, and sequential fallbacks
• fail closed when live primary-source data is unavailable
• strengthen financial data contracts, valuation independence, market-share definitions, and point-in-time handling
• harden financial calculation, report audit, and scraper path-safety tools
• remove hard-coded local checkout paths from generated Codex prompts
• regenerate Codex skill adapters and add regression tests

Why

The repository's issue and pull-request feedback repeatedly highlighted portability, live-data reliability, source independence, financial rigor, and safe local execution. This change consolidates those themes into enforceable skill contracts and tested tooling.

Impact

• 62 files changed
• 15 regression tests added/passing
• 19 Codex skills and 19 Codex prompts pass generated-output consistency checks
• no upstream pull request is opened; this draft PR lives only in the fork

Validation

• python -m unittest discover -s tests -v
• python scripts/sync-codex-skills.py --check
• python scripts/sync-codex-prompts.py --check
• python -m py_compile ...
• git diff --cached --check