feat: migrate to Zig 0.16

[apotema]

Summary

Migrates zspec from Zig 0.15 to 0.16.

• @Type(.{ .@"struct" }) → @Struct(...) (factory.zig)
• std.testing.refAllDeclsRecursive → small local implementation (zspec.zig)
• std.time.Timer → clock_gettime-based MonoTimer (runner.zig)
• std.process.getEnvVarOwned → std.c.getenv / Win32 fallback (runner.zig)
• std.fs.File → std.Io.File with raw libc open/write/close for output paths
• std.PriorityDequeue migrated to unmanaged API (.empty, push(alloc, ...), popMin)
• dumpStackTrace now takes *const std.debug.StackTrace
• std.posix.exit → std.process.exit
• Stripped source-context viewer that depended on the reworked SelfInfo API
• ArrayListUnmanaged → .empty; std.Io.Writer.Allocating for writers
• std.time.timestamp → clock_gettime(.REALTIME) (junit.zig)

Status

• zig build: ✅ PASS
• zig build test: ✅ PASS (51/51 lib unit tests + fixture + factory_union + factory_zon + examples — over 110 total)

[apotema]

@copilot review

[Copilot]

@copilot review

Reviewed at dd3bb5e. I re-checked the branch and ran automated PR validation; with no new code changes in this pass, validation reported no additional issues.

[Copilot]

Pull request overview

Migrates zspec internals, examples, and CI configuration toward Zig 0.16 compatibility while preserving the custom test runner, factory helpers, and JUnit output support.

Changes:

• Replaces removed/changed Zig std APIs with local implementations or Zig 0.16 equivalents.
• Updates runner timing, env access, raw output/JUnit file writing, and stack trace dumping.
• Adjusts factory struct generation, unmanaged containers, examples, tests, and CI Zig version.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tests/example_test.zig	Updates allocator free slice coercion for Zig 0.16.
src/zspec.zig	Adds local recursive declaration referencing helper.
src/runner.zig	Migrates exit, output file handling, timer, priority dequeue, env reading, and stack trace dumping.
src/junit.zig	Migrates ArrayList/writer usage, timestamping, and JUnit file output.
src/factory.zig	Migrates runtime struct creation to @Struct.
examples/fsm_integration_test.zig	Updates unmanaged array list initialization.
.github/workflows/coverage.yml	Updates coverage workflow Zig version.
.github/workflows/ci.yml	Updates CI matrix Zig version.

Comments suppressed due to low confidence (1)

src/runner.zig:635

• This now dumps every frame directly, so the SmartStackTrace path no longer uses isFrameworkFrame to filter runner/expect/std frames even though the runner and the remaining tests still describe that as its behavior. That regresses the user-facing stack trace signal-to-noise; either preserve the filtering with the new 0.16 APIs or update/remove the dead filtering code and tests.

    const index = std.mem.indexOf(u8, test_name, marker) orelse return false;
    _ = std.fmt.parseInt(u32, test_name[index + marker.len ..], 10) catch return false;
    return true;
}

fn isSetup(t: std.builtin.TestFn) bool {

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