### execution trigger
# Fixture preparation succeeded for the shared collision vault.
# The intended concurrent trigger was:

```sh
(swift run banal publish --json --vault /tmp/banal-batch-8.xI7Ah7 > /tmp/race-a.json 2>&1; echo $? > /tmp/race-a.status) &
(swift run banal publish --json --vault /tmp/banal-batch-8.xI7Ah7 > /tmp/race-b.json 2>&1; echo $? > /tmp/race-b.status) &
```

### first launch attempt
$ swift run banal publish --vault /tmp/bf-race-vault --json
Building for debugging...
/workspaces/repo/Sources/BANALCore/Assets/AssetManager.swift:2:8: error: no such module 'UniformTypeIdentifiers'
  1 | import Foundation
  2 | import UniformTypeIdentifiers
    |        `- error: no such module 'UniformTypeIdentifiers'
exit=1

### no-build launch attempt
$ swift run --skip-build banal publish --vault /tmp/bf-race-vault --json
exit=1
error: exec error: No such file or directory (2): /workspaces/repo/.build/aarch64-unknown-linux-gnu/debug/banal .build/aarch64-unknown-linux-gnu/debug/banal publish --vault /tmp/bf-race-vault --json

### code-path readback
# Sources/BANALPublisher/BorisAdapter.swift:140-143 removes the configured shared stagingDirectory before rebuilding content.
# Sources/BANALPublisher/BANALPublisher.swift:57-68 stages and then compiles from that same mutable directory.
# Sources/BANALPublisher/SiteCompiler.swift:34-37 and :154-158 remove/copy the configured shared artifactDirectory without a lock or run-specific directory.
# BANALPublisher has no synchronization around publish.

### final result
# final result: BF-RACE-1 blocked at runtime because no publisher process could start in the Linux aarch64 environment; no concurrent JSON responses or post-race artifact readback were produced. Source inspection found destructive, unsynchronized reuse of shared staging and artifact directories, supporting the reported race condition.