feat(ci): WASI component smoke tests — hello_rust, calculator, datetime

[avrabe]

Summary

Adds runtime smoke tests to CI that actually execute WASI components through kilnd:

• hello_rust.wasm → verifies "Hello wasm component world from Rust!"
• calculator.wasm 8 + 8 → verifies "8 + 8 = 16"
• datetime.wasm → verifies "Hello Rust on ..."

Downloads pre-built components from pulseengine/wasm-component-examples v0.2.0. Runs in the core_tests_and_analysis job on every PR and push.

This catches regressions in the full pipeline: decoder → validator → runtime → WASI → component model.

Test plan

• All 3 components verified locally
• VxWorks cross-compilation passing on main

🤖 Generated with Claude Code

[github-actions]

🔍 Build Diagnostics Report

Summary

Metric	Base Branch	This PR	Change
Errors	0	0	0
Warnings	5	5	0

🎯 Impact Analysis

Issues in Files You Modified

• 0 new errors introduced by your changes
• 0 new warnings introduced by your changes
• 0 total errors in modified files
• 0 total warnings in modified files
• 0 files you modified

Cascading Issues (Your Changes Breaking Other Files)

• 0 new errors in unchanged files
• 0 new warnings in unchanged files
• 0 unchanged files now affected

Note: "Cascading issues" are errors in files you didn't modify, caused by your changes (e.g., breaking API changes, dependency issues).

✅ No Issues Detected

Perfect! Your changes don't introduce any new errors or warnings, and don't break any existing code.

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📊 Full diagnostic data available in workflow artifacts

🔧 To reproduce locally:

# Install cargo-kiln
cargo install --path cargo-kiln

# Analyze your changes
cargo-kiln build --output json --filter-severity error
cargo-kiln check --output json --filter-severity warning

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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