feat(workflows): add inbox-zero for routing the roam inbox by project

The global roam inbox (~/org/roam/inbox.org) is one shared capture file every project can see, and nothing routed its items to the project that owns them. inbox-zero claims the items prefixed for the current project, files them into that project's todo.org per the process-inbox discipline, and removes them from the shared inbox. Foreign-prefixed and unowned items stay. Every scan reports the total item count plus how many appear related to this project.

This v1 is single-destination: it routes by explicit <project>: prefix only. The domain-aware mode that would guess every item's owner and empty the whole inbox in one run is deferred until the multi-project need is concrete.

Wired into both session ends so each project touches the inbox twice a session: startup surfaces a read-only count and offer, wrap-up Step 3 sweeps the claimed set before the cleanup scripts so imported tasks ride the wrap commit. INDEX carries the trigger phrases.

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