Add outreach sequencer skill

[RYDE-PLAY]

Summary

• add outreach-sequencer as a deterministic cli-tool runx skill
• decide next-touch eligibility from durable engagement projection state
• stop fail-closed after replies/unsubscribes, enforce min_days_apart, and emit handoff-only send-as packet when eligible
• include fixtures and harness evidence for happy_next_touch, stop_replied, and missing sequence refusal

Verification

• runx skill inspect ./skills/outreach-sequencer --json
• RUNX_RECEIPT_SIGN_KID=runx-demo-key RUNX_RECEIPT_SIGN_ED25519_SEED_BASE64= RUNX_RECEIPT_SIGN_ISSUER_TYPE=hosted runx harness ./skills/outreach-sequencer --json
• node --check skills/outreach-sequencer/run.mjs

Notes

• the skill performs no send and mints no authority; it emits a runx.outreach.next_touch.v1 packet naming a separate governed send-as run
• state output follows read_projection -> decide -> append_event(idempotency_key, expected_version) with a pinned store_id

[auscaster]

Closing to consolidate: we're reviewing one PR per contributor and yours is #277 (rollback-judge). Most of these predate the July skill-tree rename, which was our break, not yours, so they can't rebase cleanly anyway.