Packaging patch — no pipeline or enforcement changes. Aligns plan-it with the shared DevOtts plugin marketplace (which also hosts `fable-it`).
What changed
- M1 — marketplace namespace. The marketplace is renamed `plan-it` → `devotts`, so the install command is now:
```
/plugin marketplace add DevOtts/plan-it
/plugin install plan-it@devotts
```
(was `plan-it@plan-it`). The GitHub `add` path is unchanged; the plugin itself is still named `plan-it` — only the marketplace namespace moved.⚠️ Breaking if you already added the marketplace under the old `plan-it` name — re-run the `add` step (or `/plugin marketplace remove plan-it` first). - M2 — version parity. Bumped `3.0.0` → `3.0.1` across all six version mirrors so plan-it tracks the same release line as the other DevOtts plugins. Release gates re-pinned to `3.0.1`.
The mirror-integrity and additive-only guarantees from v3.0.0 are unchanged. See CHANGELOG.md for the full 3.0.0 field-hardened-core notes.