v0.5.0 — design-intelligence upgrade

v0.5.0 - 2026-05-30

The Design step gets a design-intelligence upgrade: the analyzer commits to a
variance-handling pattern up front, auto-emits the matching decision-table
sidecars, validates each design against the DisC plugin before you save, and
surfaces AC-coverage gaps inline — so under-specified designs are caught at
authoring time, not at codegen. Also lowers the minimum JDK to 17.

Added

• Variance-handling pattern selection. The analyzer picks one of four patterns
  (rule-table / resolver / sealed-polymorphism / pattern-matching) per variance
  axis and records it in a top-level variancePlan, with an exhaustive mapping[]
  for rule-table and resolver axes.
• Auto-emitted decision-table sidecars. Pure-function leaves and rule-table
  appliers get their .decision.md sidecars generated from per-AC-row examples —
  one row per acceptance criterion — feeding the plugin's filled-mode codegen.
• Plugin validate-and-retry. Step 2 runs the design through the DisC plugin's
  --validate-only mode and shows refusals inline, so contract problems are fixed
  before saving.
• AC coverage on Step 2. AC ↔ participant coverage plus a per-participant
  variance-axis-count chip, so under-specified or overloaded participants are
  visible while you design.
• Model picker for the Claude CLI calls.
• Polymorphic-entity callees — interface/sealed-interface entities with
  behaviors can be called directly in the sequence, plus a resolver mapping[] schema.
• OS-native folder browser on Step 1 for connecting a project.

Changed

• Wizard reflow into Connect / Design / Sign-off / Generate, with AC rows,
  per-card purpose, auto-compose, and "Connect project" moved into Step 1.
• Codebase-grounded analyzer — fed the connected project's packages, glossary,
  and most-relevant existing types so it reuses them (existingFqn) instead of
  re-proposing.
• Abstraction discipline baked into the analyzer prompt (invariance,
  purpose-specificity, leaf freestandingness, feature-envy, composition-over-
  inheritance) plus interface/sealed-interface entity kinds.
• Callee-anchored @package recommendation on Step 4; plugin integration
  refactored behind a CodeGenerator abstraction.
• Minimum JDK lowered to 17 (was 21). DisC Studio now builds and runs on Java 17 LTS.

Removed

• Multi-level design recursion parked for MVP (single-level compose;
  defer-design trees documented but not auto-walked).
• The two "Load demo" buttons and their seeded data.