chore(cleanup): Remove 70 outdated/unused files from root directory (Phase 1)

PHASE 1: HIGH CONFIDENCE DELETIONS
Removed files that are 100% confirmed as unused/outdated:

Test Files (18):
- Kafka test scripts (4): test-kafka-*.sh
- PMD test scripts (4): test-pmd-*.sh
- Analyzer test scripts (3): test-analyzer-*.sh, test-java-analyzer.sh
- Oracle/OCIR test scripts (4): test-ocir-*.{sh,ts}, test-oracle-*.js
- Old V9 JS test files (3): test-v9-*.js

Shell Scripts (15):
- Old development scripts (90+ days, not referenced):
  RUN_RESEARCHER_NOW.sh, ci-validator.sh, comprehensive-test-fix.sh,
  debug-testing-package.sh, enable-test-fixes.sh, eslint-check.sh,
  find-eslint-errors.sh, jest-diagnostic.sh, organize-files.sh,
  pre-push-checklist.sh, prepare-fix.sh, prepare-merge.sh,
  rebuild-and-test.sh, rebuild-core.sh, start-push.sh

JS/TS Files (10):
- Old researcher scripts (7): check-*.js, run-researcher-*.js, run-enhanced-researcher.js
- Old test configs (3): preview-test-prompts.js, jest.config.integration.js, setup-tests.js

Documentation (14):
- Old V9 docs (6): FINAL_V9_REPORT_FOR_REVIEW.md, final-v9-report.md,
  v9-grouped-report-*.md, V9-KEY-FILES-LOCATION.md, V9-PRODUCTION-READY-REPORT.md,
  V9-SUCCESS-ALL-TOOLS-WORKING.md
- Old changelogs/process docs (6): CHANGELOG*.md, CI_LOCAL_TESTING.md,
  DEPENDABOT_FIXES_*.md, PR_DESCRIPTION.md, quick-todo-*.md
- Misc (2): WARP.md, ORACLE-ARM-COMPATIBILITY-ISSUE.md

Config/Data Files (13):
- Old env files (7): .env.backup, .env.oracle-*, .env.redis, .env.sample, .env.test, brave.env
- Test output/data (6): dump.rdb, final-v4-test.yaml, final_report.json,
  kafka_test_results.txt, pmd_multithread_results.txt, gitignore_template.txt

IMPACT:
- Total: 70 files deleted
- Size freed: ~600KB
- No functional code removed
- All deleted files verified as unused in codebase

NEXT: Phase 2 will remove Oracle/Docker scripts and recent test scripts after tests pass

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: alpsla