Clean up completed reference roadmap docs

docs/roadmap/implementation.md

@@ -1,21 +0,0 @@
-# LLM And Reference Expansion Completed
-
-This roadmap item is implemented.
-
-Notarius now supports first-class LLM access for chunk, extract, and normalize
-modules, plus target-aware reference declaration, binding, CLI override,
-materialization, provenance, and runtime delivery for chunker, extractor, and
-normalizer targets.
-
-Current behavior is documented in:
-
-- [CLI Reference](../cli.md)
-- [Configuration](../config.md)
-- [Pipeline Internals](../internal/pipeline.md)
-- [Module Internals](../internal/modules.md)
-- [JSON Output](../integrations/json-output.md)
-- [Troubleshooting](../troubleshooting.md)
-
-Deferred reference work remains tracked in [Future Work](future.md), including
-non-file reference producers, token budgeting, structured references, and
-reference preprocessing or retrieval.