feat: enrich diagnostics and device capture output

[quaxalber]

Summary

• Print the compact read-only smoketest summary as a normal pass line in non-verbose output and as a bold Read-only summary: line in verbose output.
• Improve device capture live output with a spinner, countdown, spaced metrics, and stable value coloring.
• Handle Ctrl-C captures with a warning followed by the regular [+] Wrote: success flow and capture validation summary.
• Enrich device capture schema v2 with input properties, summarized EV_MSC, event-type coverage, first/last monotonic timing, per-code samples, timestamped hidraw samples, and a compact live evdev sample sequence.
• Document that users should exercise representative controls during the capture countdown.

Validation

• venv/bin/python -m unittest tests.test_device_capture -v
• venv/bin/python -m unittest discover -s tests -v
• venv/bin/python -m black --check src tests
• venv/bin/python -m ruff check src tests
• venv/bin/python -m compileall src tests
• git diff --check

Hardware note

Also deployed the already-built Pi 4B wake kernel to pi4b outside this PR and validated that the host booted 6.12.81-b2u-wake, exposed wakeup_on_write, and passed smoketest/debug with the expected no-relayable-device warning.

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