feat!: remove the lm (large media) subcommand

[sarahetter]

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Summary

This has been deprecated for more than a year and gets less than one invocation a day. It's time 🫡

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📊 Benchmark results

Comparing with 54969fd

• Dependency count: 1,214 ⬇️ 1.07% decrease vs. 54969fd
• Package size: 317 MB ⬇️ 0.28% decrease vs. 54969fd
• Number of ts-expect-error directives: 850 ⬇️ 2.94% decrease vs. 54969fd