fix(mermaid): parse quoted participants, create, and the full sequence arrow vocabulary (#54)

* fix(mermaid): parse quoted participants, create, and the full sequence arrow vocabulary

The shipped sequenceDiagram extractor silently dropped or rejected
Mermaid-valid constructs:

- `participant "Alice Smith"` (quoted name, no alias) vanished from the
  IR because the participant regex only accepted bare [\w.:-]+ ids.
- `participant "Alice Smith" as A` and `actor "Bob Builder" as B`
  lost their quoted display names and aliases.
- `create participant B` directives were ignored.
- Bidirectional messages `A<<->>B` / `A<<-->>B` (Mermaid v11.0+)
  hard-failed with "malformed edge".
- `->` / `-->` (open arrows with no arrowhead per the Mermaid docs)
  were misclassified as filled arrows.
- A message touching a declared `actor` overwrote its shape with
  "lifeline" because endpoints were force-added as lifelines.

The fix expands the participant regex to quoted names (with or without
an `as` alias) plus the `create` prefix, teaches the message regex the
bidirectional and open arrow forms, preserves declared actor shapes, and
classifies open arrows as undirected with no arrowhead. Multi-word
endpoints introduced by quoted declarations resolve correctly while
compact forms like `A-->>B` keep their ids. All forms were verified
against the real Mermaid v11.16.1 parser.

Adds a verification gate covering every form and updates the import
reference to document the supported sequence grammar.

* chore: bump plugin version to 2.4.2

---------

Co-authored-by: Cathryn Lavery <50469282+cathrynlavery@users.noreply.github.com>
Co-authored-by: Cathryn Lavery <cathryn@bestself.co>

.codex-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "diagram-design",
   "description": "Create branded architecture, IT current-state, flowchart, sequence, state machine, ER/data model, timeline, swimlane, quadrant, radar/spider, loop/flywheel, nested, tree, org chart, layer stack, Venn, pyramid/funnel, bar, line, Gantt and scatter charts, high-level, process, medallion, data flow, DP integration, or DP security matrix diagrams as standalone HTML/SVG/PNG. Redraw .drawio/.drawio.png/.drawio.svg or Mermaid .mmd sources at a chosen size/detail; onboard brand tokens from a website; add semantic patterns, callouts, accessible motion, or sketchy/hand-drawn styling.",
-  "version": "2.4.1",
+  "version": "2.4.2",
   "author": {
     "name": "Cathryn Lavery",
     "url": "https://github.com/cathrynlavery"