setup action: write the install-root .rev stamp - #69
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The canonical local _ct-tools recipe (actions/README.md) recognizes an existing install by the .rev stamp; the action's install left none, so a consumer running both — the action for CI caching, the recipe inside `just` — repeated the install on every cold runner. The stamp is the shared install-root contract, and it rides the cache with the binaries.
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Composition fix for #63's contract: the canonical local
_ct-toolsrecipe keys on<install-root>/.rev, so the action must write it — otherwise a consumer using the action (CI cache + gate) and the recipe (local + in-justbootstrap) double-installs on every cold runner. The stamp rides the cache with the binaries.