feat(cli): install and refresh completions through CLI lifecycle #247

Job	Run time
Wright CLI GitHub Actions smoke	33s
Rust quality (stable)	17s
v1 release gates (N-level, scenarios, benchmarks)	21s
Rust quality (1.85.0)	24s
Native-vs-reference frontend differential	35s
Distribution validation (ubuntu-latest)	1m 19s
OSTW compile differential (#119)	26s
LPP client integration (#142,	36s
OverPy-to-HIR adapter	24s
Distribution validation (macos-15)	3m 49s
Distribution validation (windows-latest)	2m 27s
	11m 11s

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