chore: add .envrc for anvil-dev fabric integration#431
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When running on Lars anvil-dev VM, point MAT_VIS_CACHE at /srv/anvil/caches/mat-vis (substrate-backed, shared with vm-runner CI) so model/dataset downloads dont fill vm-devs local rootfs. HF_HOME is already exported globally via PAM session vars. On non-anvil hosts the guard skips and MAT_VIS_CACHE stays at its default (~/.cache/mat-vis). direnv hook auto-loads on cd; other machines should run direnv allow once to opt in.
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Why
Lars runs Claude Code agents on
anvil-dev(NixOS microVM, see gerchowl/anvil ADR-020). The fabric exports a set of env vars via PAM (STRATA_DATA_DIR,SCCACHE_DIR,HF_HOME, …) that every shell on vm-dev inherits — including agent subshells.This PR adds a
.envrcso direnv auto-loads project-specific bindings when youcdinto the repo on vm-dev.What changes
Route MAT_VIS_CACHE into anvil-dev substrate (/srv/anvil/caches/mat-vis) so model/dataset downloads dont fill vm-devs rootfs. Guarded — no-op on non-anvil hosts.
Activation
Run
direnv allowonce per checkout to enable. On non-anvil hosts (Mac, CI), guarded exports stay unset and code falls back to its existing defaults — zero behaviour change for non-anvil users.