fix: pin live scenario dispatch command

[galligan]

Summary

• Make the live scenario runner default to uv run --project <repo> dispatch so it always exercises the checkout that owns the scenario file, even after the runner changes into an isolated temp work directory.
• Print the resolved dispatch command in dry-run output.
• Add a regression assertion for the resolved in-tree command.

Testing

• uv run pytest tests/test_scenarios.py -q
• python scripts/run_scenario.py --dry-run tests/scenarios/basic_coordination.toml
• python /Users/mg/Developer/outfitter/dispatch/scripts/run_scenario.py /Users/mg/Developer/outfitter/dispatch/tests/scenarios/basic_coordination.toml from /tmp
• just scenario -- tests/scenarios/basic_coordination.toml
• just check

Notes

This was found while dogfooding the new live scenario harness. The old default passed under just because it inherited the repo uv context, but it could resolve a different installed dispatch when run from outside that context.

[galligan]

• fix: pin live scenario dispatch command #43 👈 (View in Graphite)
• main

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[galligan]

Merge activity

• Jun 11, 9:42 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jun 11, 9:42 PM UTC: @galligan merged this pull request with Graphite.