test: add live dispatch scenarios

[galligan]

Summary

• add scripts/run_scenario.py, a live scenario runner that starts Dispatch with isolated DISPATCH_HOME and CODEX_HOME
• add tests/scenarios/basic_coordination.toml, which creates two synthetic Codex lanes through the public CLI and verifies list/get/tail
• add a dry-run test for scenario fixture validation without live model calls
• document just scenario -- tests/scenarios/basic_coordination.toml in AGENTS, dev docs, and usage docs

Testing

• uv run pytest tests/test_scenarios.py -q
• just scenario -- --dry-run tests/scenarios/basic_coordination.toml
• uv run ruff check .
• uv run ruff format --check .
• uv run mypy src tests
• just scenario -- tests/scenarios/basic_coordination.toml
• just check

Live scenario proof

just scenario -- tests/scenarios/basic_coordination.toml passed locally using isolated temp state. It selected gpt-5.3-codex-spark, created two lanes (alpha and beta), observed both latest turns transition from started to completed, verified lane listing and transcript contents, then shut the daemon down and removed temporary state.

Notes

This is intentionally opt-in and outside just check because it uses real Codex auth/model calls. SQLite audit remains next as Linear OUT-450.

[galligan]

• test: add live dispatch scenarios #42 👈 (View in Graphite)
• main

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[galligan]

Merge activity

• Jun 11, 6:14 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jun 11, 6:14 PM UTC: @galligan merged this pull request with Graphite.