Fix finance runtime contract and validation inconsistencies

[id774]

Summary

• Keep chart-only runs on stored prices and make missing stored data fail
  without fetching.
• Persist only trading-day price rows, dropping all-empty calendar gaps.
• Reject malformed configuration values before work starts.
• Reject non-object J-Quants data rows instead of silently discarding them.
• Align the related CLI, data-contract and deployment documentation.

Compatibility

• CLI option names and valid option semantics are unchanged.
• Valid configuration values and precedence are unchanged.
• Generated file names, separators, columns and column order are unchanged.
• Indicator, model and summary formulas are unchanged.
• The corrected behaviours were accidental fallback/acceptance paths, not
  supported compatibility paths.

Version

• Candidate repository version: v1.0.2
• Release Date: TBD

Validation

• pytest — PASS (490 passed, 2 deselected)
• ruff check . — PASS
• sh -n run.sh — PASS
• sh -n deploy.sh — PASS

Scope

No dependency, cron, formula, provider endpoint, or finance-dashboard change.

🤖 Generated with Claude Code

https://claude.ai/code/session_01BGJm1r7JvjV9P8PCuuCTEr

---

Generated by Claude Code