v0.14.3

Fix the 0.14.2 Namespace command launch failure. Native named-container SSH does not supply an implicit shell, so the frame expression now runs through explicit sh -c using the existing quoting. The fake models direct argument execution and has assignment and expansion regressions.

The frame protocol, decoder, direct stdin, binary streams, and status/error precedence are unchanged. Accepted E1-F1/P2 remains. Shell-local unexported LC_ALL can become exported, and _ reflects wrapper topology; the guarantee covers configured/exported locale values.

Fresh corrected native execution and Python overhead measurements remain separate acceptance work. No lifecycle or full-model success is inferred from this release.