Port the codeanalyzer-typescript 0.4.0 Neo4j feature to Java with the same
arg entrypoints:

  --emit json|neo4j|schema  (default json)
  --app-name, --neo4j-uri, --neo4j-user, --neo4j-password, --neo4j-database

New com.ibm.cldk.neo4j package:
  - GraphProjector: pure projection of the symbol table (+ level-2 call graph)
    to graph rows. Type/Callable share a :Symbol identity; call sites, fields,
    parameters, variables, enum constants, record components are first-class
    nodes; annotations/packages are shared; entrypoints are a marker label;
    every unit-owned node carries a _unit provenance prop.
  - CypherWriter: self-contained graph.cypher snapshot (constraints, scoped
    wipe, batched UNWIND/MERGE).
  - BoltWriter: live incremental push over Bolt — diffs each compilation unit's
    content_hash, replaces only changed units (idempotent MERGE), prunes
    vanished units on a full run. Uses neo4j-java-driver 4.4.x (JDK 11/native).
  - SchemaCatalog + Schema: the in-repo graph contract (labels, relationships,
    typed properties, DDL); --emit schema serializes it to schema.json.

Tests:
  - Neo4jSchemaConformanceTest (no container): anti-drift guard asserting the
    projector never emits a label/rel/property the catalog doesn't declare, and
    that schema.neo4j.json is current.
  - Neo4jBoltWriterTest (opt-in, Testcontainers Neo4j): full push, idempotent
    re-push, and orphan pruning against a real database. Runs only when
    RUN_CONTAINER_TESTS is set.

Docs/release/packaging:
  - README: install one-liner + Neo4j graph output section + refreshed --help.
  - release.yml: publish codeanalyzer.jar, schema.json and the installer as
    release assets, with cargo-dist-style release notes.
  - packaging/install/codeanalyzer-installer.sh: curl/wget installer that fetches
    the jar and drops a `codeanalyzer` launcher on PATH.
  - neo4j-schema.drawio: diagram of the emitted property-graph schema.
  - schema.neo4j.json: checked-in graph contract. Bump version to 2.4.0.

… Bolt seam (#154)

Brings the Java Neo4j backend to parity with the Python/TypeScript siblings and
makes it a lossless projection of the IR.

Namespacing (so a Java graph can share a Neo4j DB with Py*/TS* graphs):
- all node labels J-prefixed, all relationship types J_-prefixed, constraint/index
  names j_-prefixed.
- provenance property renamed _unit -> _module (matches the siblings).
- --emit schema now writes schema.neo4j.json (matches the checked-in contract);
  release asset + README updated.
- NEO4J_URI/USERNAME/PASSWORD/DATABASE env-var fallback (flag > env > default).

Lossless projection (every Lombok entity field is represented):
- new first-class nodes :JInitializationBlock, :JCrudOperation, :JCrudQuery,
  :JComment, with J_HAS_INIT_BLOCK / J_HAS_CRUD_OPERATION / J_HAS_CRUD_QUERY /
  J_HAS_COMMENT and J_HAS_CALLSITE/J_DECLARES_VAR extended to init blocks.
- added scalar props: is_modified, file_path (callable), variable_initializers_json,
  default_value, argument_expr, is_unspecified, start/end_column on params & vars,
  docstrings, and source_kind/destination_kind on J_CALLS.
- CypherWriter.DESCENDANTS extended so the scoped wipe / orphan prune reach the new
  containment edges.

Packaging seam (lets the GraalVM native image prune the driver):
- BoltConfig + BoltSink extracted as driver-free core types; BoltWriter is the only
  class importing org.neo4j.driver.* and is loaded reflectively by Neo4jEmitter, so
  the fat jar bundles the driver (live Bolt push works) while native-image, which
  never statically references it, falls back to writing graph.cypher.

Schema contract regenerated (16 node labels, 20 relationship types, 15 constraints);
conformance test updated; neo4j-schema.drawio refreshed to the J-prefixed schema
with the call graph (J_CALLS / J_RESOLVES_TO) drawn explicitly.