Align scouter uploads and command registration safety

[diese-tech]

Summary

• Enforce the canonical 10 MiB match-screenshot limit.
• Remove placeholder /rules from runtime dispatch, guild registration, /help, and live-command documentation.
• Centralize the explicit nine-command manifest so planned ADR-009 commands cannot register without handlers and contracts.
• Add runtime rejection coverage for admin-only division commands.
• Include deployment scripts in typechecking and cover the registration manifest with tests.

Why

The storage bucket accepts 10 MiB while SALbot accepted 20 MiB, and /rules exposed placeholder repository content. Registration, runtime dispatch, help, and documentation also needed one canonical command inventory.

Safety and impact

• The next guild registration run removes /rules.
• Planned ADR-009 commands remain unregistered.
• Claude's Railway CI/CD and guild-registration implementation is not duplicated or overwritten.
• No production deployment or database change is performed by this PR.

Validation

• 130 tests passed across 34 source suites.
• Bot, database package, shared package, and deployment-script typechecks passed.
• Lint passed.
• Production builds passed.
• Dependency graph is unchanged.
• git diff --check passed.