chore(beta): repoint cut-beta from deleted virtuoso-dev to main

[ChrisBeWithYou]

The 2026-07-16 dev→main consolidation deleted the standing virtuoso-dev branch and made main the single trunk. cut-beta.mjs defaulted --source to virtuoso-dev, so the beta workflow pointed at a dead ref.

• scripts/cut-beta.mjs: default SOURCE 'virtuoso-dev' → 'main'; updated header docs + the sync commit-message template.
• CLAUDE.md / AGENTS.md (mirrored): beta channel now cuts from main; WIP-alongside-stable is now --source <feature-branch>.
• docs/beta-testing.md, docs/local-dogfood.md: same repoint; replaced the "merge virtuoso-dev → main" promotion step with "land on main when green".

node --check scripts/cut-beta.mjs clean; brand-hygiene clean.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation

  • Updated beta-channel documentation to reflect main as the primary release source.
  • Clarified support for generating beta builds from feature branches.
  • Revised beta testing, local dogfooding, and promotion guidance.

• Chores

  • Updated the beta release workflow to use main by default and accurately identify the selected source branch.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 465ce452-52e2-48b4-b5c7-5bc39ea50dd1

📥 Commits

Reviewing files that changed from the base of the PR and between ceac917 and aa656ee.

📒 Files selected for processing (5)

• AGENTS.md
• CLAUDE.md
• docs/beta-testing.md
• docs/local-dogfood.md
• scripts/cut-beta.mjs

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📝 Walkthrough

Walkthrough

The beta-generation script now defaults to main, supports feature-branch sources via --source, and reports the selected source. Repository documentation updates describe the consolidated trunk and revised beta promotion workflow.

Changes

Beta source branch migration

Layer / File(s)	Summary
Update beta generation source scripts/cut-beta.mjs	The beta mirror defaults to main, supports alternate source refs through --source, and uses the selected source in the generated commit message.
Align beta workflow documentation AGENTS.md, CLAUDE.md, docs/beta-testing.md, docs/local-dogfood.md	Beta workflow guidance now describes main as the default source, feature-branch overrides, and landing work on main before stable promotion.

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

🚥 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 summarizes the main change: moving cut-beta from virtuoso-dev to main.
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 docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/repoint-cutbeta-to-main

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