Document releases v0.10.0
Renumber the candidate to 0.9.0 The acknowledgement key an operator pastes is scoped by release, so the Upgrading page now names 0.9.0/php-runtime-extensions. Pasting the old 0.8.0 key would no longer match anything the release declares, and the upgrade guard would refuse the deploy. Home and Project-Status follow the same renumber: the unreleased development line is 0.9.0, per the conservative read in #994 that keeps 1.0.0 for the version a stranger has actually installed.
Publish the cold-install documentation fixes and current project status. Brings the published Wiki up to main (ca1e65b5). Quick-Start and Troubleshooting gain the Docker Engine and Compose prerequisite links, the daemon and plugin probes, and the --ref fallback for when the release API is rate limited - the exits a cold reader actually hit on v0.7.0 (#943). Project-Status, Upgrading, and Runtime-and-Operations catch up with the unreleased 0.8.0 line, including its host-managed PHP upgrade action.
Publish dependency security update guidance
Publish reviewed Wiki foundation