feat: add experimental plant hosts

CHANGELOG.md

@@ -27,6 +27,15 @@ version drift, unsupported claims, sensitive-data guidance, and stale examples.
 
 ## [Unreleased]
 
+### Added
+- **New plant expression hosts** — Four additional experimental hosts available via `--host`:
+  `arabidopsis` (*Arabidopsis thaliana*, NCBITaxon:3702),
+  `tomato` (*Solanum lycopersicum*, NCBITaxon:4081),
+  `lemna` (*Lemna minor*, NCBITaxon:4188),
+  `wolffia` (*Wolffia globosa*, NCBITaxon:113308).
+  Codon tables derived from Kazusa CodonUsage Database and NCBI RefSeq CDS annotations.
+  All new hosts are `status: experimental`. Closes #24.
+
 ### Fixed
 
 - **`multi_constraint_pass` definition corrected (scoring_contract v1.1)**: `benchmarks/scoring.py`

docs/cli.md

@@ -20,7 +20,7 @@ factorforge optimize input.fasta -o output.fasta
 | `--gc-min` | `55` | Minimum GC% target |
 | `--gc-max` | `65` | Maximum GC% target |
 | `--format` | `fasta` | Output format: `fasta` or `genbank` |
-| `--host` | `nbenthamiana` | Expression host: `nbenthamiana` or `by2` (Tobacco BY-2) |
+| `--host` | `nbenthamiana` | Expression host: `nbenthamiana`, `by2` (Tobacco BY-2 / *N. tabacum*), `arabidopsis` (*A. thaliana*, experimental), `tomato` (*S. lycopersicum*, experimental), `lemna` (*L. minor*, experimental), `wolffia` (*W. globosa*, experimental) |
 | `--compare-profiles` | — | Comma-separated profiles to compare (e.g. `balanced,high_cai,gc_target`) |
 | `--scan-mode` | `full` | Rule scan: `full` or `fast` |
 | `--template` | — | MoClo construct template |

src/factorforge/cli/main.py

@@ -16,7 +16,14 @@
 from factorforge.engines.registry import EngineRegistry
 from factorforge.engines.profile.utils import parse_fasta_records
 
-HOST_MAP = {"nbenthamiana": "nbenthamiana", "by2": "ntabacum"}
+HOST_MAP = {
+    "nbenthamiana": "nbenthamiana",
+    "by2": "ntabacum",
+    "arabidopsis": "arabidopsis_thaliana",
+    "tomato": "solanum_lycopersicum",
+    "lemna": "lemna_minor",
+    "wolffia": "wolffia_globosa",
+}
 
 
 def _configure_stdio() -> None:
@@ -154,8 +161,16 @@ def list_engines():
 @click.option(
     "--host",
     default="nbenthamiana",
-    type=click.Choice(["nbenthamiana", "by2"], case_sensitive=False),
-    help="Expression host: nbenthamiana (default) or by2 (Tobacco BY-2 / N. tabacum)",
+    type=click.Choice(
+        ["nbenthamiana", "by2", "arabidopsis", "tomato", "lemna", "wolffia"],
+        case_sensitive=False,
+    ),
+    help=(
+        "Expression host: nbenthamiana (default), by2 (N. tabacum), "
+        "arabidopsis (A. thaliana), tomato (S. lycopersicum), "
+        "lemna (L. minor), wolffia (W. globosa). "
+        "New plant hosts are experimental."
+    ),
 )
 @click.option("--profile", "-p", default="balanced", help="Optimization profile")
 @click.option(