chore: remove orphaned shell scripts and add comprehensive audits

Removed 6 unused shell scripts (28.2 KB of dead code):
- tools/checksum_validator_multi/test_components.sh
- test/file_ops_integration/*.sh (4 files)
- .bazelci/local-testing.sh

These scripts had no references in CI, BUILD files, or active usage.

Added comprehensive project audits:
- ISSUE_AUDIT_2025-11-14.md - Honest assessment of 22 open issues
- FINAL_ISSUE_ASSESSMENT.md - Brutal honesty on actual vs claimed status
- CHECKSUM_UPDATER_NPM_ISSUE.md - Root cause analysis for checksum failures
- SHELL_USAGE_ANALYSIS.md - Complete shell usage breakdown

Project now has 6 shell scripts (down from 12):
- 1 in CI (.hermetic_test.sh)
- 5 developer tools (hermetic_test/*, scripts/test-bcr-compatibility.sh)

Transparency improvements:
- Verified 76% shell reduction claim (accurate)
- Corrected "zero shell scripts" claim (was misleading)
- Identified 3 completed issues (#44, #82, #196)
- Found root cause for checksum update failures (jco npm schema)

Author: avrabe