fix: parallel edit clarity

[RomneyDa]

Description

Opus is smart enough to interpret the previous prompt as "can only call in parallel with itself"

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Summary by cubic

Clarified the editFile tool’s parallel-calling instruction to explicitly forbid running in parallel with any tools, including itself. Prevents misinterpretation and avoids concurrent edit conflicts.

^{Written for commit 41c4f29. Summary will update automatically on new commits.}

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No documentation updates needed for this PR. This change clarifies an internal LLM instruction for the editFile tool but doesn't affect user-facing behavior or features documented in our docs.

[cubic-dev-ai]

No issues found across 1 file

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The E2E test failure is unrelated to this PR - it's a CI infrastructure issue where the test setup failed to download VS Code from Microsoft's servers ("ReadError: The server aborted pending request"). The PR only changes an internal LLM instruction string and doesn't affect any test logic. This can be safely merged once the flaky CI test passes on re-run.