Hexcrawl H4c: site interior (Enter → area map) — completes the toolkit

[deepiq2022]

H4c — Site interior ("Enter")

Final slice of the generic Hexcrawl toolkit. The site detail card (H4b) gains an Enter
button → a small interior area map for the site, inline on the World map. Two paths, mirroring
H2/H3/H4a/H4b: Crawl (reveal one area at a time) and Full (generate a fresh N-area interior,
clamp 3..12). Areas stored on the hex (HexCell.siteAreas), NEVER MapState.rooms. Gated by the
opt-in hexcrawl flag.

What's in it

• build_hexcrawl.py — authored siteAreaTypes (10), with verify() coverage. Asset
  regenerated; verified in-sync.
• HexcrawlData.siteAreaTypes getter.
• SiteArea model ({x, y, name}) + HexCell.siteAreas (omit-when-empty JSON, tolerant
  maybeFromJson, copyWith clearSiteAreas).
• rollSiteArea + nextSiteAreaPosition — a small grid-placement parallel to
  nextRoomPosition, reusing the shared _roomDirs (BFS, first area at origin, no overlap, seeded).
  Dungeon placement code untouched.
• MapNotifier.crawlSiteArea / generateSiteInterior — operate on the hex at (col,row), stored
  on the hex (Dungeon tab independent). Crawl appends one; Full regenerates a fresh clamped interior;
  both no-op on site-less / absent hexes.
• UI — an interior _HexZoom mode; the card's Enter button (gated to sited hexes) opens
  it; siteAreas render through the existing _DungeonPainter (synthetic rooms, no corridors)
  with Reveal area / Generate interior (N) / Back + a count stepper. No modal — canvas
  switches via the _zoom enum.
• CLAUDE.md — marks the hexcrawl toolkit complete.

Verification

• dart analyze: clean.
• flutter test: 767 passing (+8: model round-trip, rollSiteArea, nextSiteAreaPosition
  no-overlap, crawlSiteArea/generateSiteInterior incl. clamp + no-op, 3 widget tests driving
  canvas-tap → Enter → generate → painted area map).
• Reviewer pass: clean.
• Web build compiles; siteAreaTypes (10) confirmed bundled (HTTP 200).

Plan: docs/superpowers/plans/2026-06-14-hexcrawl-site-interior.md

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🏁 Toolkit complete

Two paths (crawl/full) × four granularity levels: Region (H2) · Dungeon (H3) ·
Local zoom 7-hex flower (H4a) · Site detail card (H4b) + interior (H4c). All authored,
system-agnostic, hexcrawl-gated.

🤖 Generated with Claude Code