[issues/646_start_new_release] Auto-create branch on release:start

[couimet]

Summary

After publishing a release, release:start prepares the repo for the next development cycle by adding an [Unreleased] section to CHANGELOG and restoring the [!IMPORTANT] banner to README. Previously it did this in-place on whatever branch you were on. Now it detects when you are on main and creates a post-release-v<VERSION> branch first.

Changes

• start-release.sh: added step 0 that checks the current branch. If on main, creates post-release-v<VERSION> and switches to it. Otherwise applies changes in-place.
• CHANGELOG.md: [Unreleased] section prepended (mechanical script output)
• README.md: [!IMPORTANT] banner restored (mechanical script output)

Test Plan

• All existing tests pass
• Manual: run pnpm release:start:vscode-extension from main and verify a branch is created

Related

• Closes QA Checklist — v2.0.0 #646

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 37e0e600-cb82-4357-b633-e92bb7838762

📥 Commits

Reviewing files that changed from the base of the PR and between 0b20c8f and fdc76f3.

📒 Files selected for processing (3)

• packages/rangelink-vscode-extension/CHANGELOG.md
• packages/rangelink-vscode-extension/README.md
• packages/rangelink-vscode-extension/scripts/start-release.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch issues/646_start_new_release

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[github-actions]

✅ CI / Integration Tests (with overrides) — run summary

Duration: 0m 56s

QA TC IDs: 2 exercised across 0 features

Report: View run & artifacts

Reproduce locally: ./scripts/run-integration-tests.sh --label needs-override --exclude-label cursor --exclude-assisted

Feature breakdown

Feature	TCs	IDs

[github-actions]

✅ CI / Integration Tests (automated) — run summary

Duration: 11m 6s

QA TC IDs: 161 exercised across 0 features

Report: View run & artifacts

Reproduce locally: ./scripts/run-integration-tests.sh --exclude-label requires-extensions --exclude-label cursor --automated

Feature breakdown

Feature	TCs	IDs

[github-actions]

✅ CI / Integration Tests (with extensions) — run summary

Duration: 13m 4s

Unit tests: Ran in separate Test & Validate job

QA TC IDs: 193 exercised across 0 features

Report: View run & artifacts

Reproduce locally: ./scripts/run-integration-tests.sh --exclude-label cursor --exclude-label needs-override --exclude-assisted

Feature breakdown

Feature	TCs	IDs