docs(readme): the sponsorship and feature-request policy covers all platforms

README.md: the Sponsorship for Personal Use section now states the one policy
(feature requests for Windows, Linux and macOS come from current GitHub sponsors
at $5/month and above, individual commercial use licence holders and approved
contributors; other [FEAT] issues are closed automatically; bug reports are open
to everyone). The Community paragraph asks reporters to choose the platform.
Statements about the licence are untouched. One OWNER marker asks what sponsors
get now that the private macOS repository is retired.

Not verified beyond reading the rendered diff.

README.md

@@ -100,7 +100,9 @@ complete [CLI reference](https://lgug2z.github.io/komorebi/cli/quickstart.html).
 There is a [Discord server](https://discord.gg/mGkn66PHkx) available for
 _komorebi_-related discussion, help, troubleshooting etc. If you have any
 specific feature requests or bugs to report, please create an issue in this
-repository.
+repository and choose the platform (Windows, Linux or macOS) your report is about;
+see [Sponsorship for Personal Use](#sponsorship-for-personal-use) for who can
+submit feature requests.
 
 There is a [YouTube
 channel](https://www.youtube.com/channel/UCeai3-do-9O4MNy9_xjO6mg) where I post
@@ -148,6 +150,15 @@ the Discord server, get shout outs at the end of _komorebi_-related videos on
 YouTube, gain the ability to submit feature requests on the issue tracker, and
 receive releases of komorebi with "easter eggs" on physical media.
 
+Feature requests for all platforms (Windows, Linux and macOS) are accepted from
+current [GitHub sponsors](https://github.com/sponsors/LGUG2Z) on the $5/month tier
+and above, people with a valid [individual commercial use
+license](https://lgug2z.com/software/komorebi), and approved contributors. Issues
+titled `[FEAT]: ` opened by anyone else are closed automatically. Bug reports are
+open to everyone.
+
+<!-- OWNER: with the private macOS repository retired, what do sponsors get beyond Discord roles, shout-outs, feature requests and (where stated) easter-egg releases? Nothing else is promised here. -->
+
 If you would like to tip or sponsor the project but are unable to use GitHub
 Sponsors, you may also sponsor through [Ko-fi](https://ko-fi.com/lgug2z), or
 make an anonymous Bitcoin donation to `bc1qv73wzspc77k46uty4vp85x8sdp24mphvm58f6q`.