[CI] Preserve exhaustive default G01 coverage within bounded process deadlines #64

Goal

Make the default offline G01 suite complete within the existing per-process deadline without omitting tests, examples or fuzz seeds.

Context and dependencies

Bounded follow-up under #1 after merged #61 / PR63. Native dependency #61 is closed. Reuse the active parent Goal; no additional native goal. Luna/max implementation and independent review. This is default untagged coverage, not the tagged120s partitions already fixed.

PR59 run34202466178/job101984197937 failed default Go1.26.8 race livecanary at45.014s, while TestBaselineAmbiguousWireAndAcquireEnvelope/acquire/trailing was active. Read-only diagnosis on runtime-identical main found the parent completes1.5–1.9s isolated, trailing0.07–0.11s in bounded repeats; full local race package35–38s. TestBaselineStatisticsPresenceAndEligibility dominates around13s. Local passing runs do not prove hosted Linux reliability. Evidence: https://github.com/1XP-AI/gh-runnerd/actions/runs/34202466178/job/101984197937

Scope / TDD acceptance

• Preserve Go1.26.8/race/count1/default no-live tags and45s perprocess, no blind rerun/time-widen/drop or dynamic scheduling.
• Meaningful generated executable sentinel red beforeimplementation, including heavyweight/default remainder, otherpackages, Example Output and Fuzz seed witnesses. Prove positive exactlyonce and each failure propagates.
• Minimal static disjoint exhaustive defaultG01 split: heavy named test in livecanary, unfiltered remaining ./... excluding that exact name. Verify no tests in otherpackages can be silently excluded by global skip (scope carefully).
• Existing four tagged groups and one taggedvet, othermodule checks and exclusions unchanged.
• Actual default normal/race inventory/pergroup timings plus tagged/tooling/full offline validation with exactcommands/results; do not infer hosted reliability fromlocalpass.
• Independent Luna/max review and exactheadCodex clean+hostedCI required before SHA-matched merge. Focused PR with red evidence/remaininggaps/source-onlyrollback.

Ownership / limits

Dedicated branch/worktree, only scripts/check-offline-experiments.sh, scripts/tooling_test.go, docs/CI.md. No G01 runtime overlap with active #60, no PR59 readiness edits or historical evidence rewriting. No live endpoint/App/credential/runner/workflow/Docker/Lima/Keychain/launchd changes.