FlashDreams preparation

Rules

• Start downloads, extraction, compilation, native loading, and model construction in IApplication.init or nested within.
• Logic after IApplication.init should consume a cached 'prepared' state. If data is missing, raise an error; do not prepare lazily.

Commands

uv run flashdreams-run-v2 <slug> --preload-application -- <app-args>

Preload runs IApplication.init and one model block. It defaults to warn; ordinary runs default to none. Override either with FLASHDREAMS_PREPARATION_POLICY=none|warn|error.

Findings include a full stack trace with every detected "failure", emitting results in preparation_issues.txt, or FLASHDREAMS_PREPARATION_ISSUES_PATH when set.