Harden Relay worktree base creation

[sungjunlee]

Summary

• canonicalize stable path prefixes while creating the Relay-owned worktree suffix component-by-component
• reject pre-existing Relay home/worktree-base symlinks before any branch, worktree, or target write
• preserve platform-owned aliases such as macOS /tmp and record the Retire vNext transition vocabulary #1198 documentation follow-ups

Verification

• full serialized gate: 626 pass / 0 fail / 2 expected skips (628 tests)
• relay-dispatch: 357 pass / 0 fail / 2 expected skips
• append-learnings: 49/49 pass
• ledger generate/check and runtime inventory pass
• independent review: LGTM after two P2 fixes

Fixes #1191
Parent: #1197

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: edf4dabd-ee97-4fa5-91db-7c484bf9dfca

📥 Commits

Reviewing files that changed from the base of the PR and between 8f529ff and a1723cd.

⛔ Files ignored due to path filters (2)

• tests/ledger/vnext-baseline.generated.json is excluded by !**/*.generated.*
• tests/ledger/vnext-test-sites.generated.json is excluded by !**/*.generated.*

📒 Files selected for processing (5)

• backlog/sprints/2026-07-relay-runtime-core-reset-vnext.md
• backlog/sprints/2026-08-relay-runtime-slimming.md
• skills/relay-dispatch/scripts/dispatch.js
• skills/relay-merge/references/append-learnings.md
• tests/relay-dispatch/scripts/dispatch-vnext.test.js

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Treat only complete parent segments as escapes

When RELAY_HOME or an explicit RELAY_WORKTREE_BASE contains a valid component beginning with two dots, such as /tmp/..relay, path.relative() returns ..relay/worktrees and this prefix check rejects it as an escape even though it remains beneath stablePrefix. Check for suffix === ".." or suffix.startsWith(..${path.sep}) instead so these valid absolute configurations can dispatch.

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