skill: add update-sponsor for README sponsor list and triage labelsupdate-sponsor

Sync README.rst's four sponsor marker blocks and the sponsor/priority
labels from live GitHub Sponsors data.

Sponsors are listed chronologically, oldest first. A private sponsor is
masked to the first 3 characters of their login plus a fixed four stars,
with no avatar and no profile link, and never receives the public
Sponsor label -- only the priority one, so the tier perk is delivered
without disclosing a sponsorship they chose to keep private.

Labels start at the Word tier, matching the Sponsor label's own "Word+
tier" description. Adafruit members are tagged from the org's public
member list; hathach is excluded there, or every self-authored ticket
would be tagged as an incoming Adafruit report.

Every run previews a README diff and a table of ticket links, authors
and pending labels, then asks before applying. The watermark in the
gitignored state.json advances only after a real apply, so a dry run or
a declined prompt cannot cause the next run to skip tickets.

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