CRAN pre-submission cleanup

[TroyHernandez]

Pre-submission review pass (CRAN cookbook walk + probes). Findings fixed:

DESCRIPTION

• Single-quote software names: 'FFmpeg' (Title + Description), 'OpenTimelineIO', 'rotio'.
• Add reference URLs: FFmpeg https://ffmpeg.org/, OpenTimelineIO https://opentimeline.io/.
• Add URL and BugReports (now-public GitHub repo).

Docs

• Add @examples to exported align_overlaps().
• Add @param/@return to internal rms helpers (.rms_filter, .parse_rms).

Deliberately unchanged

• Examples stay \dontrun: they need the ffmpeg binary (a SystemRequirement, not guaranteed on CRAN hosts) plus user-supplied media files, the canonical \dontrun case, not \donttest.

Checks (all --as-cran, 1 NOTE = 'New submission' only, 0 errors/warnings)

• Local Linux: clean
• windows-hr R 4.6.0: clean
• windows-hr R-devel: clean

Version bump 0.1.0.7 -> 0.1.0.8.

[TroyHernandez]

Superseded. Every change in this PR is already on main: the quoted software names and reference URLs plus URL/BugReports in DESCRIPTION, cran-comments.md, the align_overlaps() example, the @param/@return blocks on the rms helpers, and the pull_request-only CI trigger. A reverse diff (git diff cran-presubmission main) shows main strictly ahead with nothing missing. Closing rather than merging to avoid replaying a 0.1.0.8 version bump over the current 0.1.0.13.