Merge branch 'worktree-agent-a63474e92b05425a5'

# Conflicts:
#	Cargo.lock
#	Cargo.toml

tickets/018-sequence-diagram.md

@@ -0,0 +1,28 @@
+# 018 — Sequence diagram of events (future idea)
+
+> The README lists this under "Ideas... that can be implemented in the future, but
+> not now." Not scoped for current implementation — tracked here so it isn't lost.
+
+## Summary
+
+Let users declare sequence-diagram participants from params or matchers (e.g.
+`node_id`), then render a sequence diagram of captured events of interest. No
+relation between nodes is modeled — only event sequence/ordering determines the
+diagram.
+
+## Scope (sketch, not final)
+
+- Participant declaration referencing an existing param
+  ([001](001-param-declarations.md)), e.g. "one participant per distinct value of
+  `node_id`".
+- Event-of-interest selection, likely reusing FilterBar syntax
+  ([005](005-filterbar-pest-parser.md)) to define which log lines become diagram
+  events.
+- Rendering: a sequence-diagram view (e.g. mermaid `sequenceDiagram`) driven by
+  ordered matching events per participant.
+
+## Depends on
+
+- [001 — Param declarations](001-param-declarations.md)
+- [005 — FilterBar pest parser](005-filterbar-pest-parser.md) (likely, for
+  event-matcher syntax reuse)