release: 0.23.0 (seven builder defects and gaps, one bump)

[dcj]

Bumps __version__ to 0.23.0, promotes [Unreleased], adds the tag link. No code changes.

Seven issues, all filed by a consumer converting a multi-device adapter onto DeviceTreeBuilder, each with a runnable reproduction. Batched into one release rather than a patch now and a minor later, since every version bump costs a Yocto image rebuild downstream.

Fixed — all silent in production

#72	conditionally_settable was inert. The property came out not-settable, which looked right; the entity_setter was registered only when settable was true, so a later set_settable(True) opened a /set topic with no translator and the property accepted commands and discarded them. The only route the API offered for runtime settability, and it did not work.
#77	A value the model already held never reached the wire, so a producer whose model predates the tree published its declared default forever. Reachable only since 0.22.0 — before the reuse fix, twin and model started equally empty.
#73	remove() raised when the model had already dropped the group, leaving the device gone from the broker and a corpse in the builder that short-circuited the next add().
#75	remove() left deferred descendants, so resolve_deferred() rebuilt a torn-down device.
#76	add() recorded bookkeeping after materializing, stranding a live broker-visible device on a raise or a re-entrant call.

Added / Changed

#78	remove_capabilities(), the inverse of extend().
#74	Bookkeeping keyed on the resolved device id rather than DeviceSpec object identity, so a producer can re-derive its spec set freely instead of holding a process-lifetime map the API never told it to keep.

Minor rather than patch: #78 adds a method and #74 changes a documented contract.

Verification

• 700 tests pass (600 at 0.20.1, 653 at 0.21.0, 680 at 0.22.0)
• ruff check / ruff format --check clean; markdownlint clean
• python -m build produces both artifacts; wheel METADATA reads Version: 0.23.0
• Version agrees across ebus_sdk.__version__, pyproject.toml's dynamic attr, and the setup.py regex shim

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