Bump versions for release: toolbox, mcp, lightrag, unstructured2graph

[antejavor]

Summary

Prepares four packages for release. All are bumped as pre-1.0 minor
versions (feature/breaking batches):

Package	Version	Notes
memgraph-toolbox	0.1.11 → 0.2.0	The #211 tool-module consolidation (individual tool files merged into schema.py, several tool classes removed) was never version-bumped or released — PyPI's latest is still 0.1.11 with the old tools. mcp-memgraph's server already imports the new schema.py classes (EnumSchemaTool, NodeSchemaTool, etc.), so releasing a new mcp-memgraph without this would resolve a stale toolbox and fail to import.
mcp-memgraph	0.2.0 → 0.3.0	Covers the toolbox integration rewrite (#211) and readOnlyHint tool annotations (#213). Bumps its memgraph-toolbox floor to >=0.2.0 to match.
lightrag-memgraph	0.2.0 → 0.3.0	The prior 0.2.0 bump was also never published (PyPI is still on 0.1.6). This release bundles everything since: round-trip fixes, GC-lag logging, storage backend dedup, lightrag-hku version guard, zero-config default restore, defaulting embedding_func to Memgraph's local sentence-transformer, and the new DEFAULT_EMBEDDING_DIM/DEFAULT_MODEL_NAME exports (#243).
unstructured2graph	0.2.0 → 0.3.0	Same situation — 0.2.0 was never published (PyPI still on 0.1.5). Bundles create_property_index rename, entity workspace derivation, idempotent chunk ingestion, optional lightrag_wrapper, and vector index parameterization (#238–#243). Bumps its lightrag-memgraph floor to >=0.3.0 since it now imports DEFAULT_EMBEDDING_DIM.

No source code changes — version/dependency-pin metadata only, plus the corresponding single-line self-version update in memgraph-toolbox/uv.lock.

Test plan

• ruff check . / ruff format --check . pass repo-wide
• memgraph-toolbox test suite (47 passed) against a live Memgraph container
• mcp-memgraph test suite (44 passed) against a live Memgraph container
• lightrag-memgraph test suite (39 passed, 1 pre-existing unrelated failure reproduced on main too — a GC-lag-timing integration test, not caused by this change)
• unstructured2graph test suite (19 passed, 1 skipped)
• After merge: manually trigger the Release memgraph-toolbox, Release mcp-memgraph, Release lightrag-memgraph, and Release unstructured2graph GitHub Actions workflows (workflow_dispatch) to actually publish to PyPI — toolbox must be released before or alongside mcp-memgraph to avoid a broken install.