Add new RFCs to the README

[jspisak]

Adding historical RFCs to keep things up to date..

Summary

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation
• New environment
• Refactoring

Alignment Checklist

Before submitting, verify:

• I have read .claude/docs/PRINCIPLES.md and this PR aligns with our principles
• I have checked .claude/docs/INVARIANTS.md and no invariants are violated
• I have run /pre-submit-pr (or bash .claude/hooks/lint.sh and tests) and addressed all issues

RFC Status

• Not required (bug fix, docs, minor refactoring)
• RFC exists: #___
• RFC needed (will create before merge)

Test Plan

Claude Code Review

[greptile-apps]

Greptile Summary

This PR adds four historical RFC links (RFC 002-005) to the README's RFC section. All RFC files exist in the rfcs/ directory and the PR numbers have been verified against git history. This is a documentation-only change with no code modifications.

Key additions:

• RFC 002: Discoverability of environment tools by agents (PR [RFC 002] Discoverability of environment tools by agents #32)
• RFC 003: Add MCP support (PR [RFC 003] Add MCP (Model Context Protocol) support - Phase 1 #224)
• RFC 004: Delayed rewards support for trajectory-based scoring (PR RFC 004: Add delayed rewards support for trajectory-based scoring #337)
• RFC 005: Agentic Harness Integration (PR [1/4] RFC 005: Agentic Harness Integration #387)

All links follow the existing format and point to valid pull requests.

Confidence Score: 5/5

• This PR is safe to merge with no risk - it only adds documentation links
• Score reflects documentation-only change with verified RFC links and PR numbers. No code changes, no tests affected, no architectural impact. All added links have been validated against the repository.
• No files require special attention

Important Files Changed

Filename	Overview
README.md	Added historical RFC links (002-005) to maintain documentation completeness

_{Last reviewed commit: 1ffc692}

[wukaixingxp]

LGTM