feat(skills): add optional theme-factory skill

Hermes-native port of Anthropic's theme-factory agent skill
(anthropics/skills, Apache-2.0 — verified; upstream LICENSE.txt
shipped verbatim in references/). Ten professional font+color themes
for styling HTML artifacts (slides, docs, reports, landing pages),
theme definitions byte-faithful, plus a compact gallery table and a
generate-new-theme flow. Credit: Anthropic.

tests/skills/test_theme_factory_skill.py

@@ -0,0 +1,143 @@
+"""Tests for the theme-factory Hermes optional skill port."""
+import re
+from pathlib import Path
+
+import pytest
+import yaml
+
+SKILL_DIR = (
+    Path(__file__).resolve().parent
+    / ".." / ".." / "optional-skills" / "creative" / "theme-factory"
+).resolve()
+SKILL_MD = SKILL_DIR / "SKILL.md"
+
+EXPECTED_THEMES = [
+    "arctic-frost",
+    "botanical-garden",
+    "desert-rose",
+    "forest-canopy",
+    "golden-hour",
+    "midnight-galaxy",
+    "modern-minimalist",
+    "ocean-depths",
+    "sunset-boulevard",
+    "tech-innovation",
+]
+
+
+def _split(text: str):
+    assert text.startswith("---\n"), "SKILL.md must start with YAML frontmatter"
+    _, fm, body = text.split("---\n", 2)
+    return yaml.safe_load(fm), body
+
+
+@pytest.fixture(scope="module")
+def skill():
+    return _split(SKILL_MD.read_text(encoding="utf-8"))
+
+
+def test_skill_md_exists():
+    assert SKILL_MD.is_file()
+
+
+def test_frontmatter_valid_yaml(skill):
+    fm, _ = skill
+    assert isinstance(fm, dict)
+
+
+def test_frontmatter_fields(skill):
+    fm, _ = skill
+    assert fm["name"] == "theme-factory"
+    assert fm["version"] == "0.1.0"
+    assert fm["author"] == "Anthropic (anthropics), Hermes Agent"
+    assert fm["license"] == "Apache-2.0"
+    assert fm["platforms"] == ["linux", "macos", "windows"]
+
+
+def test_description_constraints(skill):
+    fm, _ = skill
+    desc = fm["description"]
+    assert isinstance(desc, str)
+    assert len(desc) <= 60, f"description is {len(desc)} chars (max 60)"
+    assert desc.endswith(".")
+
+
+def test_metadata_hermes(skill):
+    fm, _ = skill
+    hermes = fm["metadata"]["hermes"]
+    assert hermes["tags"] == ["Themes", "Design", "HTML", "Styling"]
+    assert hermes["related_skills"] == ["claude-design", "sketch"]
+
+
+def test_required_sections(skill):
+    _, body = skill
+    for section in [
+        "## When to Use",
+        "## Theme Gallery",
+        "## Procedure",
+        "## Generating New Themes",
+        "## Pitfalls",
+        "## Verification",
+    ]:
+        assert section in body, f"missing section: {section}"
+
+
+def test_upstream_attribution(skill):
+    _, body = skill
+    intro = body[:600]
+    assert "anthropics/skills" in intro
+    assert "Apache-2.0" in intro
+
+
+def test_theme_reference_files_exist():
+    themes_dir = SKILL_DIR / "references" / "themes"
+    assert themes_dir.is_dir()
+    found = sorted(p.stem for p in themes_dir.glob("*.md"))
+    assert found == EXPECTED_THEMES
+
+
+def test_license_file_is_apache():
+    lic = SKILL_DIR / "references" / "LICENSE.txt"
+    assert lic.is_file()
+    text = lic.read_text(encoding="utf-8")
+    assert "Apache License" in text and "Version 2.0" in text
+
+
+def test_gallery_table_matches_theme_count(skill):
+    _, body = skill
+    gallery = body.split("## Theme Gallery", 1)[1].split("##", 1)[0]
+    rows = [
+        line for line in gallery.splitlines()
+        if re.match(r"^\|\s*\d+\s*\|", line)
+    ]
+    assert len(rows) == len(EXPECTED_THEMES) == 10
+
+
+def test_gallery_names_match_reference_files(skill):
+    _, body = skill
+    gallery = body.split("## Theme Gallery", 1)[1].split("##", 1)[0]
+    for stem in EXPECTED_THEMES:
+        display = stem.replace("-", " ").title()
+        assert display in gallery, f"gallery missing theme: {display}"
+
+
+def test_theme_files_have_palette_and_typography():
+    for stem in EXPECTED_THEMES:
+        text = (SKILL_DIR / "references" / "themes" / f"{stem}.md").read_text(
+            encoding="utf-8"
+        )
+        assert "## Color Palette" in text
+        assert "## Typography" in text
+        assert len(re.findall(r"#[0-9a-fA-F]{6}", text)) >= 4
+
+
+def test_skill_md_references_theme_dir(skill):
+    _, body = skill
+    assert "references/themes/" in body
+
+
+def test_hermes_tool_framing(skill):
+    _, body = skill
+    for tool in ["write_file", "read_file", "browser_navigate", "browser_vision"]:
+        assert f"`{tool}`" in body, f"missing Hermes tool framing: {tool}"
+    assert "architecture-diagram" in body