docs: prepare README and CHANGELOG for 0.1.0 release

CHANGELOG.md

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+# Changelog
+
+This file documents relevant project changes for public releases.
+
+## [0.1.0] - YYYY-MM-DD
+
+### Added
+
+- Packaging structure under `src/`.
+- Consolidated public API for variance testing, normalization, battery execution, simulation, and visuals.
+- Support for `input_kind="log_prices"` and `input_kind="returns"` in the public variance-ratio workflow.
+- Common input normalization utilities shared by test orchestration paths.
+- Weak-form battery v1 with variance ratio multi-q, Holm family summary, Ljung-Box variants, runs test on signs, and ARCH LM.
+- Offline examples under `examples/`.
+- Minimal CI coverage for core quality checks.
+
+### Changed
+
+- Variance ratio implementation was hardened for robustness across edge cases.
+- Non-computable scenarios are handled explicitly with structured outcomes and warnings instead of silent failures.
+- Rolling support was introduced partially for variance ratio multi-q, Ljung-Box returns, and Ljung-Box squared returns.
+
+### Notes
+
+- Rolling is intentionally not applied in this version to Holm summary, runs test, or ARCH LM.
+- Release `0.1.0` is documented as ready for maintainer-driven publication workflows.