ci: add scalar fallback fuzzing targets

[hellobertrand]

Allows fuzzers to verify correctness on platforms without SIMD support, such as WASM, RISC-V, s390x, and ppc.

Summary by CodeRabbit

• Tests
  • Added a scalar-mode build of the roundtrip fuzzer alongside the existing default fuzzer builds.
• Documentation
  • Updated the documented fuzzing workflow triggers: pull requests and manual runs are listed, while scheduled runs are no longer listed.

[coderabbitai]

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• Configuration used: defaults
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Reviewing files that changed from the base of the PR and between b9204c6 and fb3fe4a.

📒 Files selected for processing: 2

• .clusterfuzzlite/build.sh
• .github/workflows/README.md

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📝 Walkthrough

The fuzz build script now creates per-build object directories and adds a SIMD-disabled roundtrip output. The workflow README no longer lists a scheduled trigger every three days.

Changes: Fuzzer build outputs

Layer / File(s)	Summary
Default and scalar fuzzer builds .clusterfuzzlite/build.sh	A parameterized build function compiles library and fuzzer objects into per-build directories. The script builds the existing fuzzer set and adds a SIMD-disabled roundtrip output with the _scalar suffix.

Workflow trigger documentation

Layer / File(s)	Summary
Documented workflow triggers .github/workflows/README.md	The documented fuzzing.yml triggers retain pull requests and manual dispatch and remove the scheduled run every three days.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to fb3fe

The PR adds a scalar roundtrip fuzz target without changing workflow triggers; no actionable merge risk is established.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: adding scalar fallback fuzzing targets in CI.
Docstring Coverage		Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files. (1 skipped: 1 …
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files. (1 skipped: 1 unsupported.)

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