Phase 8 — Prerelease cutting (write-side)
ADR-0009 §3.3 Phase 8. Deferred to phase 8 because the substrate must exist before you can cut prereleases from it.
Gate (refreshed 2026-07-30 post-ADR-0009): the first v1.0.0-alpha.N cut fires through the pipeline from main; v1.0.0-alpha.N → beta.N → rc.N sequence works from main as the Go port completes toward v1.0.0. Single-stack direction — no separate v2/next cut target.
Related existing trackers: #476 (prerelease-cut write-side capability — framing refreshed 2026-07-30) rolls into this phase. #477 (trigger-branch parameterization) closed 2026-07-30 as structurally obsolete post-ADR-0009 — single-stack has only main as trigger, no parameterization needed.
Discipline (§5): two-phase-commit-ordering for the prerelease semver bump + tag creation; contract-driven for the semver prerelease grammar.
References: ADR-0009 §3.3 phase 8, §2.3 (prerelease cadence). See #509 (phase-8 epic) for decomposition. Companion trackers in the same ADR-0009 propagation wave: #603 (v2→v1 renumber, merged), #609 (Tier 2 branch-strategy.md rewrite, deferred).
