docs: add beginner workflow guide

[xiazl1993]

Summary

• Add a beginner workflow guide for starting with OpenSpec from a small project
• Cover initial specs, reviewing generated artifacts, handing work to Codex, WSL2/VS Code notes, and keeping the first spec lightweight

Validation

• Documentation-only change
• Confirmed the PR diff only adds docs/beginner-workflow.md
• Not applicable: no code changes

Summary by CodeRabbit

• Documentation
  • New beginner-focused guide for the OpenSpec workflow
  • Describes the complete process: initialization, proposing changes, reviewing generated artifacts, applying and verifying changes
  • Includes practical setup tips for development environments

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 304fcf39-ff53-4dd2-a057-842f817cb1f7

📥 Commits

Reviewing files that changed from the base of the PR and between e364630 and 7144d1e.

📒 Files selected for processing (1)

• docs/beginner-workflow.md

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📝 Walkthrough

Walkthrough

This PR adds a beginner-focused workflow guide for OpenSpec that walks new users through initializing a project, proposing a narrow change, reviewing generated artifacts, handing off to Codex for implementation, verifying results, and archiving the completed change, with practical tips for WSL2 and VS Code environments.

Changes

Beginner Workflow Documentation

Layer / File(s)	Summary
OpenSpec beginner workflow guide docs/beginner-workflow.md	New documentation describing the OpenSpec-first workflow: project initialization, proposing narrow changes, reviewing proposal artifacts, Codex-assisted implementation, verification and archival, plus developer environment setup tips (WSL2/VS Code) and guidance on keeping initial specifications small.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• Fission-AI/OpenSpec#969: Documents OpenSpec first workflow and initiative-first structure, providing complementary architectural context to the beginner workflow guide.
• Fission-AI/OpenSpec#241: Updates beginner workflow documentation for post-openspec init first-change steps, related at the workflow documentation level.

Suggested reviewers

• TabishB

Poem

🐰 A little guide hops into the docs,
Showing beginners how OpenSpec rocks—
Init, propose, review with care,
Codex builds while rabbits stare.
From spec to task, the path is clear! ✨

🚥 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 'docs: add beginner workflow guide' directly and clearly describes the main change: adding documentation about a beginner workflow. It is concise, specific, and accurately reflects the changeset content.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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