Add Lacuna V1 model card

README.md

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+---
+license: apache-2.0
+base_model: ByteDance-Seed/Seed-Coder-8B-Base
+library_name: transformers
+tags:
+  - code
+  - code-completion
+  - code-editing
+  - fill-in-the-middle
+  - autocomplete
+  - lacuna
+---
+
+# Lacuna V1
+
+Lacuna V1 is an experimental code edit completion model.
+
+It predicts replacement code for numbered edit regions inside a Seed-Coder FIM
+prompt. It is a completion model, not a chat model.
+
+## Marker Format
+
+Markers define the regions to replace.
+
+- Region 1: `<|marker_1|>` opens, `<|marker_2|>` closes
+- Region 2: `<|marker_3|>` opens, `<|marker_4|>` closes
+- Additional regions continue with the same numbered pattern
+
+The prompt should contain the surrounding code context and marker placeholders.
+The completion starts at the first marker and returns the replacement span with
+markers included.
+
+## Typical Input
+
+```text
+<[fim-suffix]>
+  return total;
+}
+
+<[fim-prefix]>
+function sum(items) {
+  let total = 0;
+  for (const item of items) {
+    <|marker_1|><|marker_2|>
+  }
+
+<[fim-middle]>
+<|marker_1|>
+```
+
+## Typical Output
+
+```text
+<|marker_1|>
+total += item.value;
+<|marker_2|>
+```
+
+For multiple edited regions, the output keeps the same marker order:
+
+```text
+<|marker_1|>
+first replacement
+<|marker_2|><|marker_3|>
+second replacement
+<|marker_4|>
+```
+
+## Completion Settings
+
+```text
+temperature: 0
+top_p: 1
+max_tokens: 256
+```
+
+Use a larger `max_tokens` value for longer or multi-region edits.
+
+## Limitations
+
+Lacuna V1 is experimental. It can produce incorrect code, incomplete
+replacements, or malformed marker spans. Validate output before applying edits
+automatically.
+
+## License
+
+Apache-2.0.