feat(events): follow mode via ring sequence cursor, plus demo-watch console - #106
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…onsole The ring assigns each event a monotonic Seq at Emit; Filter and the events RPC gain a since_seq cursor; marvel events --follow polls once a second and prints each new event exactly once, surviving ring wraparound. just demo-watch builds the four-pane tmux operator console (driver, live session table, event tail, daemon log poll) so demo acts can be watched as they happen instead of reconstructed afterwards. docs/demo.md gains a Watching-live section.
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Demo acts read better watched than replayed, and the ring was poll-only: the operator had to rerun marvel events and eyeball what was new. The ring now assigns each event a monotonic Seq at Emit, the events RPC takes a since_seq cursor, and marvel events --follow (-f) polls once a second printing each new event exactly once, in order, surviving ring wraparound. The Seq cursor is also the primitive any future ring subscriber seam needs (relates question-marvel-otel-architecture sub-question on ring fan-out).
just demo-watch builds a four-pane tmux operator console (driver shell, live session table via get sessions -w, events --follow tail, daemon log poll); docs/demo.md gains a Watching-live section. Verified live on kinu: a follow process captured a crash-kill, drain, and respawn as they happened, each event printed once. Two new ring unit tests (monotonic Seq across wraparound, SinceSeq strictly-greater cursor); full suite and golangci-lint clean. Additive only: seq is a new optional JSON field, existing invocations unchanged.