Fix locked plan transfer across worktrees #515

Job	Run time
race-critical	55s
repository-contract	30s
component-standard-flow	18s
component-kernel-mechanism	10s
test (ubuntu-latest)	1m 11s
test (macos-latest)	1m 0s
test-windows (0)	56s
test-windows (3)	2m 15s
flow-sdk	21s
component-surface-parity	16s
test-windows (5)	1m 45s
test-windows (2)	1m 12s
test-windows (1)	1m 1s
component-extension-conformance	14s
component-control-program-compiler	21s
component-plant-integration	32s
test-windows (4)	56s
	13m 53s

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