feat(agent): add validation review sibling

[ncolesummers]

Summary

• add the isolated validation-reviewer Eve sibling on openai/gpt-5.6-terra with xhigh reasoning
• expose narrow digest-bound readers for patches, test plans, validation results, screenshots, and commit-pinned repository files
• disable generic read, write, shell, web, question, and task tools
• add the root-only apply_validation_review_result persistence boundary
• add fixture routing and the discoverable validation-review/issue-49-review eval

Why

This slice puts the model-facing reviewer on top of the deterministic evidence and transition contracts introduced by #91. The sibling can emit typed findings and recommendations but cannot mutate durable state or GitHub.

Stack

1. feat(validation): persist review evidence and routing #91 — durable evidence, persistence, and routing core
2. This PR: Eve reviewer, tools, and eval
3. docs(architecture): propose validation review cycles #93 — ADR and architecture documentation

Merge in order. After #91 merges, retarget this PR from codex/49-validation-evidence to main.

Validation

• bun run validate
• bun run build
• bunx eve info — compile ready, zero diagnostics
• bunx eve eval --list — validation-review eval discovered
• bunx eve eval validation-review/issue-49-review — explicitly invoked; local provider execution remains environment-blocked at listen EPERM 127.0.0.1

Part of #49.

Co-authored with OpenAI Codex (GPT-5).

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