fix: Fix the config dependencies format

docs/getting-started.md

@@ -249,6 +249,9 @@ Example project manifest:
 name = "geometry"
 version = "0.1.0"
 requires-arx = ">=1.0"
+dependencies = [
+  "sciarx>=0.0.3,<1",
+]
 
 [environment]
 kind = "conda"
@@ -269,6 +272,11 @@ for example `">=1.0,<2"`. `[build-system].dependencies` declares installable
 packages needed to build the project. If omitted, Arx defaults to `arxlang`; if
 `requires-arx` is present, the default build dependency uses that constraint.
 
+Use `[project].dependencies` to declare runtime Arx package dependencies.
+Entries use standard dependency requirement strings, so packages may be
+unconstrained (`"sciarx"`), version constrained (`"sciarx>=0.0.3,<1"`), or
+direct references (`"sciarx @ ../sciarx"`).
+
 Use `__init__.x` as the package root. Arx uses `src/` as the default source root
 when `[build].src_dir` is omitted. Inside a nested module such as
 `geometry.shapes.area`, use relative `from` imports for nearby modules and

packages/arx/src/arx/schema/arxproject.json

@@ -22,8 +22,7 @@
     },
     "dependency": {
       "type": "string",
-      "minLength": 1,
-      "pattern": "^[A-Za-z0-9][A-Za-z0-9._-]*( @ \\S+)?$"
+      "minLength": 1
     },
     "dependency_group_name": {
       "type": "string",

packages/arx/src/arx/settings.py

@@ -25,9 +25,6 @@
     import tomli as tomllib
 
 DEFAULT_CONFIG_FILENAME = ".arxproject.toml"
-_DEPENDENCY_PATTERN = re.compile(
-    r"^(?P<name>[A-Za-z0-9][A-Za-z0-9._-]*)(?: @ (?P<location>\S+))?$"
-)
 _DEPENDENCY_GROUP_NAME_PATTERN = re.compile(r"^[A-Za-z0-9][A-Za-z0-9._-]*$")
 _DEPENDENCY_GROUP_NORMALIZE_PATTERN = re.compile(r"[-_.]+")
 _DEFAULT_SRC_DIR = "src"
@@ -501,7 +498,7 @@ def _reject_arxpm_sections(data: dict[str, Any]) -> None:
     raise ArxProjectError(
         ".arxproject.toml does not support [arxpm] sections. "
         "Declare dependencies in [project] using "
-        'dependencies = ["name", "name @ ../path"].'
+        'dependencies = ["name", "name>=1.0,<2", "name @ ../path"].'
     )
 
 
@@ -530,12 +527,14 @@ def _validate_dependency(value: str, location: str) -> None:
       location:
         type: str
     """
-    if _DEPENDENCY_PATTERN.fullmatch(value) is not None:
-        return
-    raise ArxProjectError(
-        f".arxproject.toml {location} must be either a package name "
-        'like "http" or a direct reference like "mylib @ ../mylib".'
-    )
+    try:
+        Requirement(value)
+    except InvalidRequirement as err:
+        raise ArxProjectError(
+            f".arxproject.toml {location} must be a valid dependency "
+            'requirement like "http", "sciarx>=0.0.3,<1", or '
+            '"mylib @ ../mylib".'
+        ) from err
 
 
 def _validate_project(data: dict[str, Any]) -> None:

packages/arx/tests/python/test_settings.py

@@ -38,6 +38,7 @@
     edition = "2026"
     dependencies = [
       "http",
+      "sciarx-utils>=0.0.3,<1",
       "mylib @ ../mylib",
     ]
     authors = [
@@ -92,6 +93,7 @@ def test_load_settings_from_text_full_example() -> None:
     assert settings.project.edition == "2026"
     assert settings.project.dependencies == (
         "http",
+        "sciarx-utils>=0.0.3,<1",
         "mylib @ ../mylib",
     )
     assert settings.project.authors[0].name == "Ivan Ogasawara"
@@ -278,10 +280,13 @@ def test_build_system_dependencies_reject_invalid_requirement() -> None:
     "dependency",
     [
         "http",
+        "sciarx>=0.0.3",
+        "sciarx>=0.0.3,<1",
+        "sciarx==0.0.3",
         "mylib @ ../mylib",
         "utils @ git+https://example.com/utils.git",
     ],
-    ids=["registry", "path", "git"],
+    ids=["registry", "lower-bound", "bounded", "exact", "path", "git"],
 )
 def test_project_dependencies_support_canonical_strings(
     dependency: str,
@@ -299,6 +304,19 @@ def test_project_dependencies_support_canonical_strings(
     assert settings.dependency_groups == {}
 
 
+def test_project_dependencies_reject_invalid_requirements() -> None:
+    """
+    title: Reject invalid requirement strings in runtime dependencies.
+    """
+    content = _project_toml('dependencies = ["bad dep @"]\n')
+
+    with pytest.raises(
+        ArxProjectError,
+        match=r"project\.dependencies\[0\]",
+    ):
+        load_settings_from_text(content)
+
+
 def test_dependency_groups_with_plain_string_entries_parse() -> None:
     """
     title: Parse non-runtime dependency groups from top-level settings.
@@ -388,7 +406,10 @@ def test_dependency_group_entries_reuse_dependency_string_rules() -> None:
         """
     ).lstrip()
 
-    with pytest.raises(ArxProjectError, match="schema validation"):
+    with pytest.raises(
+        ArxProjectError,
+        match=r"dependency-groups\.dev\[0\]",
+    ):
         load_settings_from_text(content)