Add merge references and retry config

docs/cli.md

@@ -49,8 +49,8 @@ Flags:
   use one Scriptorium profile ID.
 - `--session-id id`: pass a stable prompt session identifier through LLM-backed
   module calls.
-- `--reference selector=path`: bind a reference path to a chunk, extractor, or
-  normalizer reference slot. Repeatable.
+- `--reference selector=path`: bind a reference path to a chunk, extractor,
+  merger, or normalizer reference slot. Repeatable.
 - `--without-reference selector`: remove a configured optional reference binding.
   Repeatable. It accepts the same selector forms as `--reference`, without
   `=path`.
@@ -59,12 +59,12 @@ On success, the command prints the completed pipeline ID, normalized output and
 rejected output counts, and the output directory. If the run completes with warnings,
 the warning count is printed to stderr.
 
-Reference flags are resolved against selected chunk, extractor, and normalizer
+Reference flags are resolved against selected chunk, extractor, merger, and normalizer
 targets before the run starts. Flat slot names are accepted only when exactly
 one selected target declares that slot. Bound reference files are read before
 pipeline work starts, validated as UTF-8 text, and recorded as provenance for
 the target that declares the slot. Runtime reference content is passed to the
-chunker, extractor, or normalizer target that declares the slot. Notarius infers
+chunker, extractor, merger, or normalizer target that declares the slot. Notarius infers
 reference media types from file extensions for provenance and for optional slot
 checks. Reference content is not written to diagnostics, logs, errors, or
 manifests.
@@ -81,9 +81,11 @@ Reference binding precedence is:
 
 - `slot=path`: valid when exactly one selected target declares `slot`;
 - `chunk.slot=path`: target the chunker;
-- `lane.slot=path`: valid when exactly one selected extractor or normalizer in
-  that lane declares `slot`;
+- `merge.slot=path`: valid when exactly one selected merger declares `slot`;
+- `lane.slot=path`: valid when exactly one selected extractor, merger, or
+  normalizer in that lane declares `slot`;
 - `lane.extract.slot=path`: target a lane extractor;
+- `lane.merge.slot=path`: target a lane merger;
 - `lane.normalize.slot=path`: target a lane normalizer.
 
 Use `slot=path` when the selected targets declare the slot unambiguously:
@@ -105,7 +107,7 @@ go run ./cmd/notarius run dnd-session \
   --reference spells.extract.glossary=./campaign-glossary.txt
 ```
 
-The same grammar can target chunk and normalize slots when the configured
+The same grammar can target chunk, merge, and normalize slots when the configured
 modules declare them:
 
 ```sh
@@ -113,6 +115,7 @@ go run ./cmd/notarius run dnd-session \
   --config path/to/config.yml \
   --input examples/seriatim-minimal-transcript.json \
   --reference chunk.scene_guide=./campaign-scenes.txt \
+  --reference spells.merge.merge_notes=./merge-notes.txt \
   --reference spells.normalize.normalization_notes=./normalization-notes.txt
 ```