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Bootstrap Migration Checklist

The numbered-stage bootstrap has been retired. This checklist records the remaining path from a seed-rooted bootstrap to autonomous self-hosting.

Overview

Bootstrap trust, compiler generation, and official self-host completion are separate contracts. The seed path is complete; autonomous compiler generation is still in transition.

Responsibilities

• Keep the seed manifest and executable synchronized.
• Reject fallback compilers and retired bootstrap paths.
• Report self-hosting gaps instead of treating transition output as complete.

Invariants

• Only the manifest-pinned seed may initialize bootstrap execution.
• All bootstrap gates are blocking and deterministic.
• Full self-hosting requires parity and removal of every transition bridge.

Data Flow

vittec0.seed installs bin/vittec0, which validates and builds the canonical compiler entry. Generated compilers rebuild that same entry only inside the self-host completion audit.

Completed

• Checked: Pin toolchain/seed/vittec0.seed with a manifest and reviewed source.
• Checked: Declare a single seed item in toolchain/bootstrap-config.json.
• Checked: Remove numbered stage sources and bootstrap scripts.
• Checked: Remove active build, test, CI, release, install, and package references to numbered stages.
• Checked: Make missing or invalid seed state fatal with no compiler fallback.
• Checked: Run bootstrap CI gates as blocking jobs.
• Checked: Verify deterministic seed installation, IR, and native fixture emission.
• Checked: Keep the repository host-source audit free of bootstrap exceptions.

Remaining

• Open: Remove the transition bridge from generated compiler payloads.
• Open: Obtain byte-identical successive compiler generations.
• Open: Compile the full compiler, runtime, and standard library with the generated compiler without delegating to the seed or a host compiler.
• Open: Validate every supported object, archive, executable, and cross-target format through dedicated platform gates.
• Open: Make python3 tools/selfhost_completion_audit.py --strict-complete pass.

Required Evidence

make seed-verify
make bootstrap-source-of-truth
make bootstrap-vitte-hard-gate
make bootstrap-verify
toolchain/test_bootstrap_reproducibility.sh
python3 tools/selfhost_completion_audit.py --strict-complete

The first four commands prove the current seed-rooted bootstrap contract. Only the strict self-host completion audit can close the final migration item.