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Adds the `inc` pub/sub bus so napplets that declare it boot and can exchange
topic events: `inc.subscribe {topic}` / `inc.unsubscribe {topic}` register
interest, `inc.emit {topic, payload}` fans out an `inc.event {topic, payload,
sender}` to OTHER subscribed napplet sessions (never echoing the sender) — the
kehto runtime's inc contract.
- Router edge ops (gated on the INC declaration alone, like identity.watch —
no per-call consent): SubscribeInc/UnsubscribeInc/EmitInc outcomes.
- Protocol: readTopic/readPayloadRaw + encodeIncEvent.
- NappletIncBus in the broker service routes across the live napplet sessions
(the one service every sandbox binds), keyed by reply Messenger.
- Tests for inc routing + declaration gating; updated capability/router tests
that asserted the old "inc/theme/notify are unknown" behavior.
NOTE: napplets run foreground-only/one-at-a-time, so cross-napplet delivery is
usually a no-op in practice; the bus is correct if sessions ever overlap. It is
app-wide (not author-scoped) — a future refinement could namespace topics by
author. Unblocks feed/profile-viewer/chat/bot. See the plan doc.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016ncMHuBBVHEf7spAoSssde