ci(fuzz): drop sccache from Fuzz Smoke (Windows server crashes on GNS TUs)

[drsnuggles8]

Summary

• Fuzz Smoke has failed every scheduled run since 2026-07-03 with the exact same failure signature the Windows ASan job hit before d93b5af5 dropped sccache there: the Windows sccache server crashes mid-build on GameNetworkingSockets' largest TUs (steamnetworkingsockets_shared/certs/certstore.cpp) with An existing connection was forcibly closed by the remote host (os error 10054).
• A local clang-cl build of GNS with no sccache completes fine, so sccache itself is the failing component, not our code.
• Mirrors the proven fix from d93b5af5: build both matrix legs (asan, ubsan) without the sccache launcher — direct compile, full cold build every run. Same tradeoff already accepted for the ASan job.
• Fixes Fuzz smoke fails again #573.

Test plan

• YAML syntax validated (py -c "import yaml; yaml.safe_load(...)")
• Trigger a workflow_dispatch run of "Fuzz Smoke" and confirm both asan and ubsan matrix legs go green
• Close Fuzz smoke fails again #573 once confirmed

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated the fuzz smoke workflow to run without compiler caching, improving reliability of the build process.
  • Kept fuzz execution and crash artifact upload behavior unchanged.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 61418a71-2135-43ca-a37d-19b371d2a09a

📥 Commits

Reviewing files that changed from the base of the PR and between 291556b and 7e8f8c8.

📒 Files selected for processing (1)

• .github/workflows/fuzz.yml

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📝 Walkthrough

Walkthrough

The fuzz smoke GitHub Actions workflow removes sccache-based compiler caching entirely: the global environment variable, the setup step, the CMake compiler-cache flag, and the stats-reporting step are deleted, with an added comment explaining the intentional omission for Windows builds.

Changes

Fuzz Workflow sccache Removal

Layer / File(s)	Summary
Remove sccache configuration and reporting .github/workflows/fuzz.yml	Removes the SCCACHE_GHA_ENABLED env var, the Setup sccache step, the -DOLO_ENABLE_COMPILER_CACHE=ON CMake flag, and the Show sccache stats step, adding a comment explaining sccache is intentionally excluded due to a Windows build failure.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main CI change: removing sccache from the fuzz smoke workflow.
Linked Issues check	✅ Passed	The workflow change addresses issue #573 by removing the Windows sccache dependency that was causing the daily fuzz smoke failure.
Out of Scope Changes check	✅ Passed	The diff stays focused on the fuzz smoke workflow and sccache removal, with no unrelated code or behavior changes.

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