feat(vault-tui): scrollable add/edit form + full identity field set #81

Job	Run time
test (macos-latest)	1m 1s
vault --version emits §13.2 attribution	37s
cargo-audit	3m 10s
clippy	24s
rustfmt	15s
headless build (no TUI / clipboard deps)	29s
cargo-deny	42s
test (ubuntu-latest)	30s
	7m 8s

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