Bump to v1.0.0 (first stable release; metadata maintenance)

[mstorath]

Summary

Phase 3 maintenance release for dcebe — promotes from 0.1.0 to 1.0.0 to signal API stability. No algorithmic changes; the user-facing API (estimate_bat) is unchanged from the 0.1.0 dev release.

Aligns all release-version surfaces:

• pyproject.toml::version → 1.0.0
• python/dcebe/__init__.py::__version__ → "1.0.0"
• CITATION.cff → version: 1.0.0, date-released: 2026-05-11
• CHANGELOG.md → created (was missing from the repo) with the [1.0.0] — 2026-05-11 entry

What landed in this version

• README rewritten and harmonised (Pass F) — the previous README was MATLAB-only.
• LICENSE cleaned up: non-standard "if this code is used in any scientific publication, the following paper shall be cited" clause removed. The LICENSE file is now pure Apache-2.0 matching the SPDX declaration in CITATION.cff and pyproject.toml; the citation request lives in CITATION.cff and the README.
• CITATION.cff version/date-released fields populated (Pass A).
• Auto-create GitHub Release on tag push wired up.

After merge

Tag v1.0.0 on the merge commit and push the tag. The auto-release workflow handles PyPI publish + GitHub Release creation.

Test plan

• Release workflow runs to completion on tag push
• PyPI shows dcebe 1.0.0 with the harmonised README rendering correctly
• from dcebe import estimate_bat works from the published wheel
• GitHub's license-detector identifies the repo as Apache-2.0 cleanly