The supported V3 line follows the newest release: the baseline becomes
v0.1.5-rc.1 (tag, vendored session package) and the declared release map
names 0.1.5-rc.1. The release workflow fetches the new tag, and the
disposable-profile install/uninstall was verified for real against the
published 0.1.5-rc.1 CLI (install OK -> 1 composed row -> uninstall OK ->
0 rows).
At 0.1.5-rc.1 `SidebarRightGuideEntry` regained its optional `description`
line, so the guideEntry probe pins order/title/description/icon and the
now-pointless "absent" assertion plumbing is dropped.
Every support/capability label states the 0.1.5-rc.1+ floor;
`0.1.5-alpha.x+` remains only as the V3 LOG-generation label (the format
first appeared at 0.1.5-alpha.1). The docs record the verified matrix and
the seam movement across alpha.1/alpha.2/rc.1.
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