Alejandro Gutiérrez 1ff8ff8f06 feat: implement Stories 2.4-2.7 — E-R, Org Chart, Architecture, Sequence diagram type renderers ...

Adds four diagram type renderers completing the core diagram type suite:
- Story 2.4: E-R entity nodes with column tables, relationship edges with cardinality labels
- Story 2.5: Org chart person nodes with role/department tags, hierarchy edges
- Story 2.6: Architecture nodes (service, database, queue, load balancer, external), connection edges
- Story 2.7: Sequence participant nodes with lifelines + activation bars, fragment nodes,
  3 custom edge types (sync/async/return), custom time-ordered layout (not ELK)

Story 2.7 includes code review fixes: computeLayout returns LayoutResult so enriched
sequence edges flow through useAutoLayout, activation bar computation in layout,
immutable layout function, self-message U-shaped loop rendering, sequence node size
tests in buildElkGraph.

476 tests passing across 29 test files, zero regressions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-02-27 01:24:50 +00:00

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