chore(release): 2.0.0-b7 — strict typing, py.typed, is_open

[GreenGrassBlueOcean]

Prepares the 2.0.0-b7 dev release. No behavior changes beyond what already merged to master; this just bumps the version and documents it.

What's shipping since b6

• feat(connection): add OWNSession.is_open and reset is_connected on close #35 OWNSession.is_open (closes Expose a public 'socket is open' property on OWNSession (MyHOME reads _stream_reader/_stream_writer) #34)
• feat(standards): PEP 561 typing marker and automated PyPI library standards validator #32 PEP 561 py.typed marker + library-standards validator
• fix(gateway): accept 999 sentinel as unconfigured timezone on F454 (#297) #33 F454 timezone sentinel fix (#297)
• feat(typing): achieve full strict typing compliance across OWNd (mypy --strict) #36 / feat(typing): strict typing across OWNd — re-land of #36 on master #39 full mypy --strict compliance, zero suppressions
• ci: run MyHOME's golden corpus and test suite against every OWNd change #37 CI now replays MyHOME's golden corpus + test suite against every OWNd change
• chore: one line ending for the repository (.gitattributes + renormalize + enforcing test) #38 repo-wide line-ending normalization

Why this matters

py.typed + mypy --strict clean is exactly what MyHOME's Platinum strict-typing quality-scale rule needs from this side (see custom_components/myhome/quality_scale.yaml on v2-phase1-architecture). Once this is on PyPI, MyHOME can drop the OWNd.* → ignore_missing_imports override and start getting real types instead of Any.

This PR

• OWNd/__init__.py: 2.0.0-b6 → 2.0.0-b7
• README.md: adds mypy: strict and Typed: PEP 561 badges, and a note explaining what changed

After merge

Cut the release (tag v2.0.0-b7 + GitHub Release) to trigger release.yml's PyPI publish — holding off on that until this is reviewed.

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