#skip-bb
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<!-- This is an auto-generated description by cubic. -->
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## Summary by cubic
Improved the local agent system prompt for clarity, safety, and
consistency across Pro/Basic/Ask modes. Added prompt snapshot tests and
stabilized Playwright snapshots by masking system messages in both input
and message dumps.

- **Refactors**
- Shared COMMON_GUIDELINES across all modes; strengthened security
guidance; added concise-explanations and Help-button guidance.
- Added Vitest snapshot tests for agent/basic/ask prompts and the e2e:p3
script (parallelism=3, retries=1).

- **Bug Fixes**
- Masked system messages in body.input and body.messages for all dump
types to make Playwright snapshots deterministic; updated affected
snapshots.

<sup>Written for commit 162030ad2a8c1db3e3905b7d6ac30b518d05dbda.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->