test(P5): ci + tests + readme for single-doc dual-pptx pipeline (REQ-273,274,275)

CI workflows: install python-pptx, pin CLI versions, stage both PPTX +
inlined HTML. test_slides_pipeline.py: inverted theme assertion (now
default+inline), deleted source-md tests, added 8 new tests
(penetrate absence, image inlining, python-pptx, benefit class, single
source, speaker-notes comments, default theme, css retained). New
test_pptx_generator.py: slide count, title colors, slide titles, table
rendering, image embedding, benefit callout. README rewritten for 3-step
single-document + dual-PPTX + image-inlining pipeline.

---ci---
project: acdl
phase: 5
milestone: v1.23
status: execute
phase_role: execution
---/ci---

tests/test_pptx_generator.py

@@ -0,0 +1,145 @@
+"""REQ-274: tests for `scripts/render_pptx.py` — the structured, editable
+python-pptx deck produced alongside the MARP-rendered PPTX.
+
+The python-pptx deck is a native OOXML presentation: real text boxes,
+native tables, embedded pictures, and italic benefit callouts. These
+tests are offline (no AWS, no network) and assert the structural
+properties of the committed `*-python.pptx` artifact.
+"""
+from pathlib import Path
+from typing import cast
+
+import pytest
+from pptx import Presentation
+from pptx.enum.shapes import MSO_SHAPE_TYPE
+from pptx.presentation import Presentation as PresentationT
+from pptx.shapes.autoshape import Shape
+
+ROOT = Path(__file__).resolve().parent.parent
+PRESENTATIONS = ROOT / "docs" / "presentations"
+MARPT_DECK = PRESENTATIONS / "nova-autonomous-cloud-delivery-marp.md"
+PYTHON_PPTX = PRESENTATIONS / "nova-autonomous-cloud-delivery-python.pptx"
+
+# Title slide + 20 main slides + 1 appendix slide.
+EXPECTED_SLIDE_COUNT = 22
+
+
+@pytest.fixture(scope="module")
+def prs() -> PresentationT:
+    """Load the committed python-pptx deck once for the whole module."""
+    assert PYTHON_PPTX.is_file(), f"python-pptx PPTX not found: {PYTHON_PPTX}"
+    return Presentation(str(PYTHON_PPTX))
+
+
+def _slide_titles(prs: PresentationT) -> list[str]:
+    """Return the first non-empty text-frame line per slide (the title)."""
+    titles: list[str] = []
+    for slide in prs.slides:
+        for shape in slide.shapes:
+            if not shape.has_text_frame:
+                continue
+            text = cast(Shape, shape).text_frame.text.strip()
+            if not text:
+                continue
+            # The title is the first non-empty line of the first non-empty
+            # text frame we find on the slide.
+            first_line = text.split("\n")[0].strip()
+            if first_line:
+                titles.append(first_line)
+                break
+        else:
+            titles.append("")
+    return titles
+
+
+def test_slide_count(prs: PresentationT):
+    """REQ-269/274: the python-pptx deck has 22 slides
+    (title + 20 main + 1 appendix)."""
+    assert len(prs.slides) == EXPECTED_SLIDE_COUNT, \
+        f"expected {EXPECTED_SLIDE_COUNT} slides, got {len(prs.slides)}"
+
+
+def test_title_slide_colors(prs: PresentationT):
+    """REQ-269: the title slide (slide 0) has a solid-filled background
+    shape carrying the S&P Red (#D6002A) brand color (the title slide is
+    a red-bar-on-black layout)."""
+    title_slide = prs.slides[0]
+    red_found = False
+    black_found = False
+    for shape in title_slide.shapes:
+        fill = getattr(shape, "fill", None)
+        if fill is None:
+            continue
+        try:
+            if fill.type != 1:  # MSO_FILL.SOLID
+                continue
+        except Exception:
+            continue
+        rgb = str(fill.fore_color.rgb).upper()
+        if rgb == "D6002A":
+            red_found = True
+        if rgb == "1B1B1B":
+            black_found = True
+    assert red_found, \
+        "title slide has no solid-fill shape with S&P Red (#D6002A)"
+
+
+def test_expected_slide_titles(prs: PresentationT):
+    """REQ-269/274: spot-check that key slide titles match the markdown
+    deck (The Problem, Nova's Vision, Recap + Ask)."""
+    titles = _slide_titles(prs)
+    # Build a flat lowercase concatenation for substring checks.
+    flat = " | ".join(titles).lower()
+    expected = [
+        "the problem",
+        "nova's vision",
+        "recap + ask",
+    ]
+    missing = [t for t in expected if t not in flat]
+    assert not missing, \
+        f"missing expected slide titles in python-pptx deck: {missing}; " \
+        f"found titles: {titles}"
+
+
+def test_table_rendering(prs: PresentationT):
+    """REQ-269: a slide with a table (the RACI slide) has a native PPTX
+    table shape (GraphicFrame with has_table=True)."""
+    table_slides = []
+    for idx, slide in enumerate(prs.slides):
+        for shape in slide.shapes:
+            if shape.shape_type == MSO_SHAPE_TYPE.TABLE or getattr(
+                shape, "has_table", False
+            ):
+                table_slides.append(idx)
+                break
+    assert table_slides, \
+        "no slide in the python-pptx deck has a native PPTX table shape"
+
+
+def test_image_embedding(prs: PresentationT):
+    """REQ-269: a slide with an image (the Platform Pipeline slide)
+    has a native PPTX picture shape."""
+    picture_slides = []
+    for idx, slide in enumerate(prs.slides):
+        for shape in slide.shapes:
+            if shape.shape_type == MSO_SHAPE_TYPE.PICTURE:
+                picture_slides.append(idx)
+                break
+    assert picture_slides, \
+        "no slide in the python-pptx deck has a native PPTX picture shape"
+
+
+def test_benefit_callout_present(prs: PresentationT):
+    """REQ-269/274: at least one slide has an italic text run (the
+    benefit callout, rendered as italic body text by render_pptx.py)."""
+    italic_runs = 0
+    for slide in prs.slides:
+        for shape in slide.shapes:
+            if not shape.has_text_frame:
+                continue
+            for paragraph in cast(Shape, shape).text_frame.paragraphs:
+                for run in paragraph.runs:
+                    if run.font.italic and run.text.strip():
+                        italic_runs += 1
+    assert italic_runs > 0, \
+        "no italic text runs found in the python-pptx deck (benefit callout)"