docs: record passing EncString fuzz soak (v0.1 gate #1) #97

Job	Run time
test (ubuntu-latest)	31s
vault --version emits §13.2 attribution	35s
REUSE lint	12s
cargo-audit	3m 7s
headless build (no TUI / clipboard deps)	26s
cargo-deny	44s
clippy	22s
rustfmt	13s
test (macos-latest)	48s
	6m 58s

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