Polish README adoption path

[laulpogan]

Summary

• sharpen the project pitch and SkillOpt positioning
• make the quick start, trust boundary, and architecture easier to scan
• add clearer contributor guidance and preserve verified tutorial output

Scope

• README.md only

Verification

• CodeScene pre-commit and branch-level quality gates passed
• OSS Ready README evidence and asset checks passed
• docker compose config --quiet passed
• Docker test rebuild was blocked by a host Docker metadata I/O error; CI remains the exact-environment test gate

Summary by CodeRabbit

• Documentation
  • Reframed the project as a local-first control plane for AI agent skills.
  • Expanded the Quickstart with prerequisites, setup guidance, expected output, troubleshooting, and configuration instructions.
  • Added deployment and security cautions, including authentication and Docker socket considerations.
  • Clarified default local deployment behavior and operator-focused usage.
  • Added support instructions and project status information, including the absence of a tagged release.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 954aa802-c457-4cc0-b2d9-df0dfedc1560

📥 Commits

Reviewing files that changed from the base of the PR and between 346a43d and e79d954.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

README documentation now describes Ingot’s local-first control-plane model, trusted-operator deployment assumptions, expanded quickstart and troubleshooting guidance, authentication boundaries, and support/project status.

Changes

README documentation

Layer / File(s)	Summary
Control-plane framing README.md	The introduction frames Ingot around evidence-gated routing, quarantined rewrites, and audited atomic promotion.
Operator quickstart and deployment boundary README.md	Prerequisites, setup commands, expected output, troubleshooting, authentication options, and deployment cautions are expanded.
Support and project status README.md	New guidance covers issue reporting, questions, vulnerability reports, and the absence of a tagged release.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: jamesmaki

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/oss-ready-readme

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