chore: refresh obsctl maintenance checks

[solomonneas]

Summary

• add smoke coverage for argument forwarding and environment-only password transport
• update GitHub Actions to actions/checkout@v7
• replace private-network examples with RFC 5737 documentation addresses and remove the stale script-size claim

Verification

• shellcheck obsctl install.sh hooks/pre-push test/smoke.sh
• bash test/smoke.sh - 33/33 checks passed
• CONTENT_GUARD_DIR=/home/clawdbot/repos/content-guard hooks/pre-push - no blocking findings
• isolated install.sh, followed by installed obsctl --version - obsctl 0.1.0
• checksum-verified obs-cmd 1.0.0 Linux binary, then inspected --help, scene --help, and virtual-camera --help

No live OBS instance was contacted.

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