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The rule builder's Group nesting was capped at one level (#176's Kodi model). Generalize it to recursive nesting bounded by a single shared constant, MAX_GROUP_DEPTH (types.ts, = 5, root group is depth 0): - parse.ts: replace the allowNested boolean with a depth counter that recurses to the cap; deeper input stays out of subset (null -> raw-text fallback), so parse remains the exact inverse of compile. Sub-group detection now requires the leading '(' to be the one closed by the trailing ')' (quote/escape aware), so '(a)x(b)' can't be mistaken for one wrapped group. - RuleBuilder.tsx: 'Add group' is offered while depth < MAX_GROUP_DEPTH instead of only at the root; nested group boxes get box-sizing: border-box so per-level padding can't overflow (no global reset). - roundtrip.test.ts: the 500-tree generator nests to the cap and asserts the corpus actually reached it; explicit depth-3 cases added to compile/parse/validation tests and a depth-gate test to RuleBuilder. compile.ts and validation.ts already recursed correctly and are unchanged. No backend/OpenAPI change. Docs: spa-conventions.md §12; decisions lifecycle — new active record spa.rulebuilder-nesting, predecessor spa.smartcollection-rule-builder relocated to docs/decisions/archive/spa.md as superseded. fixes #436