test(zigux): run phase2 closure gap contract by default

[adybag14-cyber]

Summary

• harden the merged Lane 22 zigux/tests/phase2_closure_gap_packet_contract_build.zig wrapper so the plain default build route runs the Phase 2 closure gap-packet contract
• keep the existing standalone phase2-closure-gap-packet-contract route and test alias unchanged
• keep scope to exactly one Zig build-wrapper file

Why This Lane

• Lane 22 owns the Phase 2 closure tranche
• the merged gap-packet contract already guards the kconfig bridge repo-reality boundary, but its build wrapper predated the newer closure-tranche convention where the plain default route runs the same contract as the named route and test alias
• fresh open PR searches found no active same-wrapper/default-route owner before publication
• this avoids edits to documentation, Python validators/checkers, manifests, workflow YAML, Makefile routes, helper implementations, fixtures, archive payloads, or shared build roots

Validation

Focused validation used attached Zig 0.17.0-dev.87+9b177a7d2 in a compact current file root grounded by authenticated current-master reads of:

• zigux/tests/phase2_closure_gap_packet_contract.zig
• zigux/tests/phase2_closure_gap_packet_contract_build.zig

Passed:

• zig fmt --check zigux/tests/phase2_closure_gap_packet_contract.zig zigux/tests/phase2_closure_gap_packet_contract_build.zig
• direct zig test zigux/tests/phase2_closure_gap_packet_contract.zig: All 3 tests passed.
• build-step listing exposed phase2-closure-gap-packet-contract, test, and the default install route
• named route phase2-closure-gap-packet-contract: Build Summary: 3/3 steps succeeded; 3/3 tests passed
• test route: Build Summary: 3/3 steps succeeded; 3/3 tests passed
• plain default route: Build Summary: 3/3 steps succeeded; 3/3 tests passed
• ASCII scan found no non-ASCII bytes in the contract or wrapper files

Publish Readback

• session issue: Zigux session 2026-06-09 12:49 UTC - Lane 22 gap default route #23147
• branch: zigux-builder/lane22-gap-default-route-20260609t1249z
• base / merge base: e940571de07b64f5c7709c92309f906fdd5fc689
• head before PR creation: 24cbe0169c3e5a9bd1810dd29b6b736ec1e103d0
• authenticated compare against master:
  • changed files: exactly one modified Zig file
  • additions: 2
  • deletions: 0
  • ahead_by: 1
  • behind_by: 0
  • status: ahead
• authenticated branch readback confirmed b.default_step.dependOn(&run_tests.step);
• immediate combined-status readback returned no statuses yet

Boundary

CI/review is the first exact full live-tree execution against complete current repository content. This intentionally does not mutate the contract body, Markdown docs, Python validators/checkers, manifests, workflow YAML, Makefile routes, helper implementations, fixtures, archive payloads, or shared roots.

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch zigux-builder/lane22-gap-default-route-20260609t1249z

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