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 recoupable/chat#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

Switch all PRs to target main and retire the test-branch staging flow. Simplifies the workflow and prevents PRs being opened against test in api and chat.

^{Written for commit 3bba054. Summary will update on new commits.}

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📥 Commits

Reviewing files that changed from the base of the PR and between 6c89de6 and 3bba054.

📒 Files selected for processing (1)

• AGENTS.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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