Admit managed continuations against exact Gitoxide heads

[zhiiw]

Summary

Admit managed-workspace continuations only from a Host-observed, owner-issued accepted Gitoxide head and commit the matching v2 claim/start path without v1 fallback.

Primary invariant

For managed-coding-v1, provider execution may start only when the planned immutable replay cursor and the currently accepted workspace boundary still match the same ContinuationClaimV2.

Scope

• Host observation of the existing accepted Gitoxide ref (no baseline creation)
• planner/execution revalidation of the exact workspace boundary
• v2 claim/start and continuation_source_v3
• v3 lineage authentication
• claim-only startup repair through the same v2 authority
• real-process rollback coverage for a killed workspace-bound start transaction

Verification

• Core and Storage builds pass
• Runtime Host build passes
• SQLite focused suite: 51/51
• Runtime continuation suite: 21/21
• SQLite real-process crash suite: 16/16

The local full Runtime/Host suites are currently blocked by the worktree's mismatched https-proxy-agent/Slack dependency installation; no changed-file TypeScript errors were reported. The matching Gitoxide helper is built by the stacked CI source, so this remains Draft until the three-platform Host kill/reopen lane is present.

中文说明

本切片只证明 managed continuation 的生产 admission：Host 从已有 accepted Gitoxide ref 和 SQLite head 重新签发 workspace boundary；planner、执行前重验、v2 claim/start、v3 lineage 与 claim-only startup repair 都消费同一身份。缺少 v2 authority、head 漂移或 ref 不一致时一律 fail closed，不回退 v1。

已通过 Core/Storage/Runtime Host 构建、SQLite 51/51、Runtime continuation 21/21、真实 SQLite crash 16/16。当前本地完整 Runtime/Host 套件受工作树依赖安装中的 https-proxy-agent/Slack 版本错配阻断；stack 对应的 Gitoxide helper 由 CI 构建。因此在三平台 Host kill/reopen lane 补齐前继续保持 Draft。

[zhiiw]

Closed as an obsolete extraction/integration slice. The current delivery path is the merged Gitoxide foundation followed by #40 -> #41 -> #42. This PR remains available as design and implementation history.

中文说明

该 PR 属于旧 extraction/integration 栈，现已失去独立合并价值。当前交付路径是已合并的 Gitoxide 基础，然后依次审查 #40 → #41 → #42。这里继续保留设计、实现与审查历史。