Refactor startup checks into domain-specific modules

[cyc60]

Summary

• Extract startup_checks() from src/common/startup_check.py into src/commands/start/startup_check.py
• Extract meta vault startup checks from src/commands/process_meta_vaults.py into src/meta_vault/startup_check.py
• Make previously private check functions public for reuse across modules

Test plan

• Verify operator start command runs startup checks correctly
• Verify process-meta-vaults command runs startup checks correctly

[Copilot]

Pull request overview

This PR refactors startup validation logic into command/domain-specific modules, moving the operator start startup checks into src/commands/start/ and meta-vault-specific startup checks into src/meta_vault/.

Changes:

• Moved operator startup_checks() implementation from src/common/startup_check.py into src/commands/start/startup_check.py.
• Extracted meta-vault startup checks from src/commands/process_meta_vaults.py into src/meta_vault/startup_check.py.
• Renamed several previously-private common startup-check helpers (e.g., check_*) to be importable from src.common.startup_check.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/meta_vault/startup_check.py	New module encapsulating meta-vault-specific startup checks used by the meta-vault processing command.
src/common/startup_check.py	Removes the top-level operator startup_checks() and exposes several helper checks as public functions.
src/commands/start/startup_check.py	New module containing the operator start command’s startup check sequence.
src/commands/start/base.py	Updates the start command to import startup checks from the new command-specific module.
src/commands/process_meta_vaults.py	Uses the extracted meta-vault startup checks module and gates execution behind skip_startup_checks.

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