docs: add agent instruction entrypoints

[casper-phantom]

Note

Low risk: This docs-only change adds one Markdown file and one relative symlink without modifying production blocklist data.

Summary

• Give coding agents one root instruction source through both standard entrypoint names.
• Record the verified list layout, validation/build commands, and production-data contribution constraints.

Validation

• git diff --check
• git ls-files -s AGENTS.md CLAUDE.md (100644 / 120000)
• yarn install --frozen-lockfile
• node ./ci.js
• CLAUDE.md resolves to AGENTS.md

Agent provenance

• implementation: Warp Oz — not exposed by host / not exposed by host

Casper-Issue-Key: blocklist/agent-instructions-symlink
casper-run-id: 01a015f1-7a63-739e-8e51-b1d3fdb51b71

Summary by CodeRabbit

• Documentation
  • Added repository guidance covering development commands, CI and runtime requirements, contribution practices, hostname formatting, wildcard handling, and deployment behavior.
  • Added a linked documentation entry for compatible development workflows.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c618edc8-8ee5-4aa0-8cca-17f3a84ca12a

📥 Commits

Reviewing files that changed from the base of the PR and between 5030186 and 8c99a52.

📒 Files selected for processing (2)

• AGENTS.md
• CLAUDE.md

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📝 Walkthrough

Walkthrough

Changes

Repository guidance

Layer / File(s)	Summary
Repository instructions and guidance link AGENTS.md, CLAUDE.md	AGENTS.md documents repository structure, commands, contribution rules, hostname handling, wildcard whitelists, and deployment behavior. CLAUDE.md links to AGENTS.md.

Merge Risk: ⚪ Minimal · up to 8c99a

This change adds repository guidance and a symlink without altering production behavior or blocklist data. No actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the addition of agent instruction entrypoints.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch casper/agent-instructions-symlink

Usage-based review receipt

• Mode: Continue automatically
• Reviewed files: 2
• Charged: $0.50
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_{Comment @coderabbitai help to get the list of available commands.}

[casper-phantom]

Closing this rollout PR because the repository did not already have root AGENTS.md or CLAUDE.md guidance. We only want to add the reciprocal entrypoint where substantive instructions already exist.