docs: publish current README and Wiki guidance Source: LeXwDeX/SpecGit@b1e0efe4fee3325119898bfb9dd02b6eca4a2433 (PR #770, Issue #769). Reviewed all 17 source pages; publish 13 changed pages and verify every page after push.
docs: align project refresh guidance with SpecGit 2.9
docs: clarify refresh ownership and preference effects
docs: add installed-project inspection and refresh guidance
docs: sync project-only installation and upgrade guides
docs: sync verified 2.3 project removal guidance
docs: reconcile Wiki with SpecGit 2.2.1 Source: LeXwDeX/SpecGit main b0df72aa796050a16dddaf5f923215970e1e53e6. Publication tracked by LeXwDeX/SpecGit#646.
docs: explain existing project upgrades and hooks