fix(ci): Free Disk Space Reliably

[refcell]

Summary

Two separate failure modes were causing no-space-left crashes on CI runners. First, the jlumbroso/free-disk-space action uses apt-get internally and silently fails when the disk is already critically full, leaving nothing freed before cache restoration or compilation. This is fixed by adding a fast rm -rf pre-clean step that removes Android SDK, .NET, GHC, Boost, and CodeQL (~15-20 GB) before apt-based cleanup runs. Second, the test-musl-sigsegv job was restoring the shared stable Rust cache, a multi-GB artifact set it has no use for given it only builds one package for a specific target. Removing that cache key eliminates the root cause of its failures.

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
base	Ignored		Apr 4, 2026 1:11am

[github-actions]

No issues found. This is a well-scoped CI fix. The two changes are straightforward and correct:

1. The fast rm -rf pre-clean runs before the jlumbroso/free-disk-space action, avoiding the circular failure where that action's internal apt-get calls fail when the disk is already critically full. Setting android: false and dotnet: false on the action correctly avoids redundant cleanup of already-removed directories.

2. Dropping the rust-cache-shared-key from test-musl-sigsegv eliminates unnecessary restoration of a multi-GB cache artifact that this single-package musl build never benefits from.