feat: add namespaced flutter command aliases

[Wreos]

Summary

• add namespaced flutter:* aliases for all canonical commands
• add alias generator script scripts/generate_namespaced_command_aliases.py
• document naming model in docs/command-namespacing.md
• update README and release checklist for namespaced command support
• bump plugin manifests to 1.10.0

Validation

• plugin schema validation passed
• markdown link sweep passed

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Regenerate existing aliases instead of skipping them

The generator currently exits early when an alias file already exists, so rerunning scripts/generate_namespaced_command_aliases.py will not refresh aliases after canonical command descriptions or instructions change. That leaves commands/flutter-*.md files stale and out of sync with the canonical command files over time, even though this script is documented as the way to regenerate aliases.

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