Add bulk solving capability to generate AI solutions for all missing problems

[Copilot]

Repository tracks 548 problems in README but only 76 have AI-generated solutions (gpt5-mini.md). This adds tooling to systematically generate the missing 472 solutions.

Changes

Enhanced auto_solver.py with three modes:

# Daily problem (original behavior preserved)
python3 auto_solver.py

# Single problem by ID
python3 auto_solver.py 123

# Bulk mode for batch processing
python3 auto_solver.py --bulk file.txt

Added identify_missing.py - Scans README, identifies problems missing gpt5-mini.md files, generates batch files (50 problems each).

Added .github/workflows/bulk_solver.yml - Manual-trigger workflow for bulk solving with configurable batch size and start index. Processes batches and auto-commits results.

Documentation - BULK_SOLVER_README.md (technical reference), QUICKSTART.md (user guide), IMPLEMENTATION_SUMMARY.md (overview).

Implementation Notes

• Reused auto_solver.py functions to avoid duplication
• Rate limiting: 2s between requests in bulk mode
• SSL verification configurable via HTTPX_VERIFY env var
• Cross-platform temp file handling via tempfile module
• All 472 problems processable in ~10 workflow runs (50 per batch, 15-20 min each)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• leetcode.com
  • Triggering command: /usr/bin/python3 python3 bulk_solver.py /tmp/test_problems.txt --dry-run (dns block)
  • Triggering command: /usr/bin/python3 python3 bulk_solver.py /tmp/mini_test.txt --dry-run (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>add solutions for all problems to date</issue_title>
<issue_description>Many problems (especially early ones) still lack solutions. We should systematically add AI-generated solutions for all problems that don't already have them. This requires:

• Carefully auditing all problems and checking for missing AI-generated solutions
• Adding solutions for each</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes add solutions for *all* problems to date #45

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