v2 doc and demo updates

[pavel-kirienko]

No description provided.

[Copilot]

Pull request overview

This PR updates the v2 documentation/demo materials and aligns the codebase/tests with an updated Topic/Node public API (exposing Node.transport, adding Topic.evictions, and making subject-id computation explicit via Topic.subject_id(modulus)).

Changes:

• Update the public API: add Node.transport, add Topic.evictions, and change Topic.subject_id into a method requiring the subject-id modulus.
• Adjust tests and the monitor example to use the new subject-id API and surface eviction/subject-id info for monitored topics.
• Refresh docs/readme styling/content and bump package version.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/test_topic.py	Update topic subject-id assertions to call subject_id(modulus).
tests/test_reliable.py	Update reliable-path tests to compute subject-id via subject_id(modulus) for arrivals and comparisons.
tests/test_parity.py	Update parity tests to use the new Topic.subject_id(modulus) API.
tests/test_monitor.py	Add assertions for flyweight topic evictions/subject_id(modulus) and update subject arrival calls.
tests/test_integration.py	Add coverage for Node.transport and update pinned topic subject-id assertions.
tests/test_gossip.py	Update gossip tests to use subject_id(modulus).
src/pycyphal2/can/init.py	Docstring link formatting update.
src/pycyphal2/_node.py	Implement flyweight evictions + new subject-id API; add NodeImpl.transport property; refactor evictions storage/mutation.
src/pycyphal2/_api.py	Extend public ABCs with Topic.evictions, Topic.subject_id(modulus), and Node.transport.
src/pycyphal2/init.py	Expand top-level package docstring and bump __version__.
README.md	Update project intro/badges and positioning text for pycyphal2 vs pycyphal.
examples/monitor.py	Improve monitor display; include evictions/subject-id; use Node.transport.subject_id_modulus.
docs/pdoc/theme.css	Adjust docstring heading styling in generated docs.

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