feat: add PR-Agent setup as comment-only code reviewer

[lyssieth]

Sets up self-hosted PR-Agent as a GitHub Action.

Workflow (.github/workflows/pr-agent.yml)

• Triggers only on issue_comment — no auto-review on PR open/update
• Scoped to lyssieth as the only allowed commenter

Configuration (.pr_agent.toml)

• Model: openrouter/meituan/longcat-2.0 via OpenRouter
• Fallback: openrouter/deepseek/deepseek-v4-flash
• Output cap: 120K tokens, token limits bumped to 1M
• Custom review instructions flagging security-critical subsystems
• Context files: AGENTS.md + CONTRIBUTING.md injected into prompts

Secrets required (already set):

• OPENAI_KEY — OpenRouter API key
• OPENAI_API_BASE — https://openrouter.ai/api/v1

Usage: Comment /agentic_review, /agentic_describe, or /ask on any PR.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 707df200-83ed-4327-9914-7c44d13a3b3f

📥 Commits

Reviewing files that changed from the base of the PR and between 905b7c8 and 1723722.

📒 Files selected for processing (2)

• .github/workflows/pr-agent.yml
• .pr_agent.toml

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