Report corrupt feedback history entries

[OnlyYu1996]

Fixes PlatformNetwork/bounty-challenge#53182.

Summary

• Stop silently dropping unreadable or malformed *.json feedback history files.
• Emit warnings for bad feedback entries in text and JSON modes.
• Return structured { entries, errors } JSON when history contains corrupted files, so automation can detect the problem.
• Add regression tests for mixed valid/corrupt history and corrupt-only history.

Validation

• cargo +1.90.0 fmt --package cortex-cli --check
• git diff --check
• Isolated rustc +1.90.0 --edition=2024 --test harness covering corrupt JSON detection while preserving valid entries

Note: targeted cargo test -p cortex-cli test_load_feedback_history_reports_corrupt_json -- --nocapture is still blocked before running tests on this Windows/MSVC environment by the existing aws-lc-sys C build failure.

[greptile-apps]

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