ci: workspace mcpp bootstrap pin -> 2026.9.14.3 (released + indexed); #634 ledger closed

Version group 2 moves to 2026.9.14.3, released from 9b6a118 and named
`latest` by the published xim index artifact `xim-index-ed04041`.

The #634 implementation plan and the triage record are marked landed. The
ledger closes every row with a reading (E1-E24 in mcpp#637, E25 in mcpp#638,
P1-P9 in mcpp-plugins#24, I1 in mcpplibs/mcpp-index#426, R1-R4, V1-V4), and
§9 records what landed, the sandbox readings on 2026.9.14.2, 2026.9.14.3 and
the 2026.9.14.1 control, the ecosystem review, and two observations this work
did not change.

Author: speak-agent

.agents/docs/2026-09-14-634-cmake-parity-items-by-home.md

@@ -1,11 +1,14 @@
 ---
 subject: triage
-status: active
+status: landed
 ---
 
 # A framework's CMake parity list: the twenty-one items of #634, read against the code and routed to where each one belongs
 
-**Status:** active, revision 3. Revision 3 is the implementation's: the plan
+**Status:** landed on 2026-09-14, revision 3: mcpp 2026.9.14.2 and 2026.9.14.3
+(mcpp-community/mcpp#637, #638), `mcpp:plugins` 0.10.0 (mcpp-community/mcpp-plugins#24),
+openxlings/xim-pkgindex#838 and mcpplibs/mcpp-index#426; the closure and the
+sandbox readings are §9 of the implementation plan. Revision 3 is the implementation's: the plan
 and ledger are `2026-09-14-634-implementation-plan.md`, whose §1 states the
 refinements adopted before and while implementing; the sections below carry
 them where a decision's wording changed (§5.2, §5.3, §5.6). Revision 1 classified the items; revision 2 held every