chore: archive v1.0 milestone

.planning/MILESTONES.md

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+# Milestones
+
+## v1.0
+
+- **Date:** 2026-05-22
+- **Scope:** Phases 1-5, 13 plans
+- **Archive:** [v1.0-ROADMAP.md](/Users/shen/Work/Code/ReadViewSDK/.planning/milestones/v1.0-ROADMAP.md)
+- **Requirements:** [v1.0-REQUIREMENTS.md](/Users/shen/Work/Code/ReadViewSDK/.planning/milestones/v1.0-REQUIREMENTS.md)
+- **Audit:** [v1.0-MILESTONE-AUDIT.md](/Users/shen/Work/Code/ReadViewSDK/.planning/v1.0-MILESTONE-AUDIT.md)
+
+### Delivered
+
+- Directly evolved the native reflowable EPUB path toward a WXRead-style renderer instead of introducing a parallel engine.
+- Added chapter-level CSS preprocessing, explicit CSS layering, and chapter-scoped renderer inputs.
+- Upgraded pagination to use richer page metadata and layouter/layout-frame semantics while preserving offset compatibility.
+- Reconnected reader restore, highlight, search, and repagination behavior without modifying `RDReaderView`.
+- Built a 5-book validation matrix across native reflowable, fixed/interactive WebKit, and TXT paths.
+
+### Known Gaps
+
+- `REND-01`, `REND-02`, `REND-03`, `REND-04`
+- `COMP-01`, `COMP-03`, `COMP-04`
+- `STAB-01`, `STAB-02`
+
+Known gaps were accepted at close as requirement bookkeeping debt; see the milestone audit for details.
+