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Nathan Nguyen
04140e47a3
* feat(app-router): promote same-layout ancestor persistence App Router soft commits previously preserved absent non-slot entries through the merge layer and kept root-layout hard-navigation policy split between browser state and planner. That made same-layout ancestor persistence implicit and allowed unknown root identity to behave like proof of reuse. The planner now returns explicit preserveElementIds for proven same-root transitions, browser state stores layoutIds from wire metadata, and visible commits preserve only planner-approved ancestors while leaving parallel-slot persistence semantics intact. Adds coverage for layout id metadata, unknown-root fallback, stale element removal, and visible layout persistence. * fix(app-router): validate layout persistence proofs App Router payload metadata treated every string in __layoutIds as planner preservation authority. That let a bad producer, stale payload, or future refactor pass a page, slot, or malformed key as proof for layout ancestor reuse. The violated invariant is that layout persistence proof must be validated before it reaches the commit planner. Parse __layoutIds through the AppElements wire-key codec and accept only layout keys. Also add dynamic segment browser coverage for /blog/[slug] navigation, proving param-sensitive layout and page content update while the layout client counter persists. * fix(app-router): scope boundary layout proofs HTTP access fallback payloads derived layout metadata from the full route definition. Layout-level access fallbacks can render only ancestor layouts, so the old proof could let the planner preserve child layouts that were absent from the response. Derive boundary layout metadata from the rendered layout module subset and mark the root boundary unknown when no route layout is rendered. * docs(app-router): document layout id ordering Document the ancestor-first layoutIds invariant at the planner snapshot boundary so future payload producers do not break same-layout prefix persistence.