docs: PRs target main; retire the test-branch PR flow

[sweetmantech]

What

PRs in this repo now target main. The test branch is retired as a PR target; the sync-test-with-main task-start ritual is removed from the agent instructions.

Why

Requested by @sweetmantech 2026-07-03 during #1841: four PRs were opened against test because these instructions mandated it; the convention is now main-only. Sibling PRs update the other repos' instructions and the dev skills (recoupable/skills#68).

🤖 Generated with Claude Code

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Summary by cubic

Make main the only PR target and retire the test branch. Removes the "sync test with main" step and updates PR creation commands in AGENTS.md.

• Migration
  • Open all PRs against main; never target test.
  • Branch from the latest main.
  • Use gh pr create --base main.

^{Written for commit 92f786a. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/prs-target-main

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[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

<sub>Auto-approved: Documentation-only change updating AGENTS.md to target main instead of test, with no code, config, or logic modifications.

Re-trigger cubic</sub>