chore: add changeset for v0.21

[TabishB]

Changes Since v0.20.0

This changeset covers the following changes:

New Features

• Feedback command (openspec feedback) — Submit feedback directly from CLI with GitHub Issue creation
• Nix flake support — Install and develop openspec using Nix with automated maintenance and CI validation

Bug Fixes

• Explore mode guardrails — Prevents implementation during explore mode to keep focus on thinking/discovery

Improvements

• Improved change inference in opsx apply — auto-detects target change from context
• Streamlined archive sync assessment with clearer delta spec guidance

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Commits included:

• 690c752 fix: prevent implementation during explore mode (fix: prevent implementation during explore mode #515)
• dd53fb7 OPSX apply: infer target change (OPSX apply: infer target change #513)
• 2a441c4 Refine opsx archive sync assessment (Refine opsx archive sync assessment #514)
• ed4d965 feat: add nix flake support (feat: add nix flake support (sorry for this duplicate) #459)
• c86985d feat: add feedback command for submitting user feedback (feat: add feedback command for submitting user feedback #509)

CI/workflow changes (bf4bc24, c57e421) are excluded per changeset guidelines.

Summary by CodeRabbit

• New Features

  • Feedback command to report issues with automatic metadata collection.
  • Nix flake support for streamlined installation and development setup.
  • Auto-detection of target changes in apply operations.

• Bug Fixes

  • Exploration mode now prevents implementation while allowing artifact creation.

• Improvements

  • Enhanced delta spec location guidance for archive sync operations.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This changeset documents v0.21 release features: a feedback command for GitHub Issue creation, Nix flake support for installation and development, an explore mode guardrail preventing premature implementation, automatic change inference in opsx apply, and clarified archive sync documentation.

Changes

Cohort / File(s)	Summary
Release notes documentation \.changeset/v0\.21-release\.md	Added v0.21 release notes describing four feature additions and bug fixes: feedback command for issue creation, Nix flake support, explore mode guardrail enforcement, change inference automation, and archive sync guidance clarification

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• chore(openspec): add feedback command change proposal #496: Implements the openspec feedback CLI feature mentioned in the release notes, including GitHub Issue creation, authentication flow, and agent feedback specifications.
• chore: add changeset for OPSX experimental workflow commands #457: Addresses related OPSX workflow features including change inference in opsx apply and archive/sync/delta-spec guidance discussed in this release.

Poem

🐰 A rabbit hops with glee,
Feedback flows so naturally!
Nix and guards keep thoughts pure,
Change inference, swift and sure—
v0.21 brings clarity! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the primary change: adding a changeset file for the v0.21 release. It is concise and specific enough for teammates to understand the main purpose.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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