fix: security vulnerabilities + dep updates

[ruvnet]

Summary

This PR fixes real bugs and addresses 35+ known CVEs across the dependency tree. No cosmetic changes.

Code Bugs Fixed

src/cache/validation.py — NameError crash in auto_repair_cache

• auto_repair_cache() returned the undefined name freed_space instead of the repair_summary dict it builds during the repair loop. Any call to this method raises NameError: name 'freed_space' is not defined.
• Fixed: return repair_summary.

src/db/connection.py — Unreachable dead code in _is_valid_table_name

• A logger.debug(...) call appeared after return True, making it permanently unreachable. Leftover from a refactor; caused flake8 F821 noise.
• Fixed: removed the unreachable statement.

Vulnerable Dependencies

requirements.txt

Package	Was	Now	CVEs fixed
litellm	1.0.0	>=1.61.15	14 CVEs (CVE-2025-0628, CVE-2024-2952, CVE-2024-4888, CVE-2024-4890, CVE-2024-5225, CVE-2024-5751, CVE-2024-8984, CVE-2024-9606, CVE-2024-10188, CVE-2026-35029, CVE-2026-35030, GHSA-69x8-hrgq-fjj8)
aiohttp	3.9.5	>=3.13.4	20 CVEs (CVE-2026-34513–34520, CVE-2026-34525, CVE-2024-52304, CVE-2025-53643, CVE-2025-69223–69230, CVE-2026-22815)
python-dotenv	1.0.1	>=1.2.2	CVE-2026-28684
anthropic	0.19.1	>=0.49.0	Outdated (12+ months behind current)
pydantic	2.8.2	>=2.10.6	Security hardening release

Pin style changed from == to >= for core deps so security patches flow through without a manual edit.

examples/arcade-dev/requirements.txt

• aiohttp>=3.8.0 lower bound covered vulnerable versions; raised to >=3.13.4.

Verification

pip-audit -r requirements.txt   # 0 known vulnerabilities after bump
flake8 src/cache/validation.py src/db/connection.py --select=E9,F63,F7,F82  # clean

Test plan

• pip install -r requirements.txt resolves without conflicts
• pip-audit -r requirements.txt reports no known vulnerabilities
• Call CacheValidator.auto_repair_cache() with a populated ValidationResult — confirm it returns a dict instead of raising NameError
• Confirm DatabaseManager._is_valid_table_name() still returns True/False correctly for valid and invalid names

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