Storybook pages B: banyan, two courtyards, gathering #257

Part of #239 · Depends on: #240 (approved style frames), #251, #253

Why

These three archetypes carry the family chapters that give the book its structure between the
opening and the lane — ancestors on the banyan, the two grandparent households, and the everyday
gatherings of parents, siblings, spouses, and children. Grouped together because they share the
same "several people, composed by relationship" shape.

What to build

site/book/story/pages/, consuming #251's page plans, #252's copy, and #253's frames/avatars/
motifs on #254's banyan and courtyard scenes:

• Banyan medallions: F's earliest known ancestors placed on the banyan's roots, medallion
  frames, with Story copy: sentences, fallbacks and kin captions #252's "N generations before F" caption.
• Two courtyards: paternal and maternal grandparents as two households (one household when
  only one side is known), each on its own courtyard scene.
• Gathering band: the shared composition for parents-with-siblings-smaller, siblings grouped
  by shared parents, spouses and in-laws, and children/grandchildren — a row-based layout using
  marigold-string marriage connectors and branch-based child placement, per the design system's
  "kinship by composition, not lines between boxes" rule.

Acceptance criteria

• All three archetypes produce valid pages for every fixture × featured-choice in Storybook QA: composer report, layout invariants, fixture and contact sheet #245's set,
  including the one-side-only grandparents case and F-as-a-child (which skips the
  spouse/children gathering per Story planner: chapters to pages #251's adaptation rules).
• Half-siblings, explicit siblings, and multiple spouses render distinctly and correctly per
  Story planner: the featured person's family, in circles #250's circle assignment, with kin captions from Story copy: sentences, fallbacks and kin captions #252.
• Gathering pages stay within the density cap (family pages ≤8 people, gatherings ≤12), and
  overflow correctly triggers a continuation page (Story planner: chapters to pages #251) rather than crowding.
• Marriage connectors and branch placement visually communicate the relationship without any
  label, matching Storybook design: the Aangan design system and six style frames (approval gate) #240's approved style frames.
• None collide with Storybook QA: composer report, layout invariants, fixture and contact sheet #245's invariants.

Tests

• Golden tests per archetype across Storybook QA: composer report, layout invariants, fixture and contact sheet #245's fixture set, including the remarriage, half-sibling, and
  multi-spouse fixtures.
• A density-cap overflow test forcing a continuation page and checking its ≥3-entry minimum.
• A one-side-only grandparents test confirming the two-courtyards archetype collapses to one
  household correctly.

Gotchas

• Composition-only kinship (marigold strings, branch placement) is a design constraint, not just a
  style choice — resist the urge to add a connecting line or label "for clarity"; that's explicitly
  against Storybook design: the Aangan design system and six style frames (approval gate) #240's approved direction.
• The two-courtyards one-side-only case is easy to test shallowly (just hide the missing side) but
  easy to get visually wrong (leftover empty space, off-centre composition) — check it visually
  against a frame, not just structurally.

Out of scope

• Cover, opening, portrait hero, closing — Storybook pages A: cover, opening, portrait hero, closing #256.
• Lane, numbers, register, still-to-be-found, legacy — Storybook pages C: lane, numbers, register, still to be found, legacy #258.

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