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Paul BakausandClaude Code
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Field session on a nested SvelteKit app surfaced a self-reinforcing leak: localStorage is per-origin, two projects reused 127.0.0.1:5174, and a React project's leftover cycling session was resumed inside the Svelte project. Its checkpoints then materialized a ghost session in the new project's durable store that kept reattaching after every discard, and a stale adapter module 401'd on live.js, hiding the picker. Four fixes: - Server: only session-creating events (generate, steer) may mint a journal. Progress events (checkpoints, mount acks, accept/discard) for unknown ids are refused with 404 unknown_session and never enqueued, so foreign browser state cannot create ghost sessions. Browser sends are gated so progress never overtakes its own creating POST (the Go-time checkpoint and generate are concurrent fetches; the first sweep caught the out-of-order arrival breaking every SvelteKit flow). Steer checkpoints now follow the steer event for the same reason. - Browser: saved sessions carry the server's appRoot; a session stamped by another project is dropped at load time. Unstamped legacy state is caught by the unknown_session refusal, which clears local state and re-arms the picker with an explanatory toast. - SvelteKit adapter: the layout import carries a token-derived revision query so a helper restart changes the module specifier and no Vite client/SSR cache can serve an adapter with a rotated-out token; live-inject --port reads the running helper's token from server.json instead of writing an unauthenticated live.js URL; script load failures log an actionable console error; and adapter removal is byte-exact (the old regex swallowed the next line's indentation). - live.mjs resolves surface briefs from appRoot, then contextRoot, then repoRoot, matching context.mjs in nested-app repos. Tests: server unknown-session rejection units, adapter revision/ byte-exact-removal units, and a foreign-session e2e scenario that seeds another project's localStorage state and asserts it is cleared, no ghost journal materializes, and picking still works. AI-assisted (Claude Code). Co-Authored-By: Claude Code <noreply@anthropic.com>