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

Set main as the PR base and retire the test branch flow. Removes the start-of-task test sync step to avoid mis-targeted PRs and simplify agent instructions.

• Migration
  • Branch from and open PRs against main (e.g., gh pr create --base main).
  • Stop using the test branch and the old sync-with-main ritual.

^{Written for commit 846dd98. Summary will update on new commits.}

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✨ Finishing Touches

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[cubic-dev-ai]

No issues found across 1 file

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Architecture diagram

sequenceDiagram
    participant Dev as Developer
    participant Agent as Claude Code Agent
    participant GH as GitHub
    participant Local as Local Git Repo

    Note over Dev,Local: NEW: test branch retired – PRs target main directly

    Dev->>Agent: Start new task
    Agent->>Local: git checkout main && git pull origin main
    Agent->>Local: git checkout -b feature-branch
    Agent-->>Dev: Ready to work

    Note over Agent,GH: Push commits and open PR

    Agent->>Local: git push -u origin feature-branch
    Agent->>GH: gh pr create --base main
    GH-->>Agent: PR URL
    Agent-->>Dev: PR ready – wait for approval

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<sub>Auto-approved: Updates AGENTS.md to target main branch and remove test-branch workflow. Only documentation change, no code or logic modified.

Re-trigger cubic</sub>