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Working on Fusion from inside a machine that already runs one, a plain
`pnpm dev` shares that instance's LIVE database. Everything durable hangs off
$HOME/.fusion — settings, credentials, central DB, the embedded Postgres data
dir — and a process pointed at a data dir whose postmaster is already running
attaches to it instead of starting its own.
--isolated spawns the dev child with HOME pointed at a sandbox, so it gets its
own settings, credentials and Postgres cluster on its own port. It also moves
the child's cwd, which is the half that is easy to miss: `fn dashboard`
derives its project from the working directory and has no project flag, so
isolating HOME alone leaves both instances on `<repo>/.fusion` — including
`.fusion/tasks/<id>/`, which the orphaned-task-dir sweep re-imports, so a
fresh dev database would adopt the real instance's tasks.
The sandbox defaults to ~/.fusion-dev/<checkout-name>/{home,project}: outside
the work tree so it neither shows up in git status nor dies on a clean
checkout, and keyed by checkout so two clones cannot collide. The project dir
is git init-ed on first use because Fusion projects are git work trees.
Changing cwd is safe because PRELOAD/LOADER/ENTRY are already absolute.
Verified in a container beside a running Fusion: the isolated instance
reported zero projects while the real one reported two, on separate Postgres
clusters (ports 42617 and 38311).
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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