feat(auto-review): condense prompt and fix inline comment formatting (#56)

* feat: condense auto-review prompt by 75% while maintaining all essential info

- Reduced prompt from ~370 lines to ~80 lines
- Condensed CRITICAL CONSTRAINTS section (removed verbose explanations)
- Streamlined REVIEW SCOPE (kept key info on incremental reviews)
- Compressed AUTOMATED CHECKS (4 subsections: URLs, Cache-Control, GitHub Actions, WalletConnect)
- Simplified RESPONSE FORMAT (removed redundant examples, kept one clear template)
- All essential information preserved: constraints, focus areas, checks, formatting rules

* feat(auto-review): enhance Context section detail in findings

Expand Context field guidance to require 4 elements: what, why,
impact, and exploitability conditions. Updated prompt instructions
and example to produce 2-4 sentence explanations instead of terse
single-line descriptions.

Updated test fixtures to match new detailed Context expectations.

* fix(auto-review): improve inline comment markdown rendering

- Add newline before code blocks in recommendations to fix GitHub rendering
- Add newline before bulleted context sections for proper formatting
- Update prompt to request structured bullet format for Context field
- Update fixtures and tests to match new bulleted Context format

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Co-authored-by: Claude <noreply@anthropic.com>

Author: bkrem