diff --git a/CHANGELOG.md b/CHANGELOG.md
index 503433f11..2efd93899 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,110 @@
 # Changelog
 
+## [1.58.0.0] - 2026-06-12
+
+## **Your documents grow diagrams. Mermaid and excalidraw fences render as real pictures,**
+## **and make-pdf now ships single-file HTML and Word output from the same markdown.**
+
+Put a ` ```mermaid ` fence in your markdown and `make-pdf` renders it as a crisp
+vector diagram, fully offline, with the source preserved for round-trips. A broken
+fence prints a loud red diagnostic block with the parse error, never silent raw
+code. The new `/diagram` skill goes the other way: describe a flow in English and
+get a triplet back, the mermaid source, an editable `.excalidraw` file you can open
+at excalidraw.com, and rendered SVG + PNG in the hand-drawn style. Images got the
+same care: local paths inline automatically and never truncate, phone photos
+downscale to print resolution instead of blowing up the file, and a wide small-text
+diagram promotes itself onto a vertically centered landscape page inside an
+otherwise portrait document. One markdown file now exports three ways:
+`--to pdf | html | docx`, where html is one self-contained file with zero network
+references. Type is bigger across the board (12pt body, 56pt cover titles), TOC
+links actually jump, and `--strict` turns missing or out-of-tree images into hard
+CI failures.
+
+### The numbers that matter
+
+Measured on this repo's README (5,940 words, lists, code, screenshots, one
+diagram fence) and the free gate suite. Reproduce: `make-pdf generate README.md
+--cover --toc` and `bun test make-pdf/test/`.
+
+| Metric | Before | After | Δ |
+|--------|--------|-------|---|
+| A mermaid fence in your PDF | raw code block | vector diagram | rendered |
+| Output formats from one markdown | 1 (pdf) | 3 (pdf, html, docx) | +2 |
+| Network requests at render time | up to 1 per remote image | 0 by default | sealed |
+| Wide-diagram handling | shrunk into portrait | own centered landscape page | rotated |
+| Free make-pdf gate tests | 121 | 189 | +68 |
+| README → 29-page PDF with diagram | n/a | 4.4s | one command |
+
+The sealed-network number is the one to notice: the mermaid and excalidraw
+runtimes are vendored into a 9.2MB sha-pinned bundle, so rendering works on a
+plane and a tracking pixel in pasted markdown fetches nothing.
+
+### What this means for your documents
+
+The diagram you describe in English stays editable forever: `/diagram` writes the
+source, you embed the source in markdown, and every export renders it fresh. Stop
+pasting screenshots of diagrams into documents. Run `/diagram` for the picture,
+` ```mermaid ` for the document, and `--to html` when the reader doesn't want a PDF.
+
+### Itemized changes
+
+#### Added
+- ` ```mermaid ` and ` ```excalidraw ` fences render as inline vector SVG in every
+  output format. Fence options: `title="..."` (caption + aria-label),
+  `render=false` (keep as code), `page=landscape|portrait` (orientation override).
+  Render failures produce a visible diagnostic block with the parse error.
+- `/diagram` skill: English in, editable triplet out (`.mmd` source,
+  `.excalidraw` scene, SVG + PNG). Flowcharts convert to fully editable
+  excalidraw scenes; other mermaid types render with an explicit limitation note.
+- `lib/diagram-render/`: vendored offline bundle (mermaid 11.12.2, excalidraw
+  0.18.0, exact pins), deterministic build, committed dist with sha256 + source
+  fingerprint, drift tests, THIRD-PARTY-LICENSES.
+- `--to pdf|html|docx` output formats. HTML is one self-contained file (inline
+  SVG diagrams, data-URI images, zero network refs, screen-readable). DOCX is a
+  content-fidelity export with diagrams embedded as 300dpi PNGs and alt text.
+- Per-image directives: `![x](a.png){width=full|50%|3in}` and
+  `{page=landscape|portrait}`.
+- Conservative auto-landscape: wide, small-text, diagram-like images get their
+  own vertically centered landscape page (aspect ≥ 1.8, width over ~2.5x the
+  content box, diagram-ish alt word). Directives override in both directions.
+- `--strict` for CI: missing images, remote images, out-of-tree image reads, and
+  oversized files fail the run instead of degrading to placeholders.
+- `docs/howto-diagrams-and-formats.md`: the full walkthrough, fences to formats.
+
+#### Changed
+- Typography scale: 12pt body, 26pt h1, 56pt poster cover with 13pt meta, 12pt
+  TOC entries, larger code and tables. Auto-hyphenation is off so copy-paste
+  yields clean words.
+- Local images inline as data URIs with byte-probed dimensions and never
+  truncate; oversized photos downscale to print resolution at inline time;
+  repeated images are read once.
+- TOC links resolve in every format (headings get real anchor ids); the screen
+  layer hides print-only page-number dots in HTML output.
+- Remote images are blocked with a visible placeholder unless `--allow-network`
+  is passed; out-of-tree image reads (including via symlink) warn loudly.
+- `make-pdf preview` prints a note when the document contains fences or local
+  images that only `generate` renders fully.
+
+#### Fixed
+- Relative image paths render correctly in PDFs (previously resolved against the
+  wrong base and could show as broken boxes).
+- Fenced code inside lists survives the render byte-for-byte; indented fences
+  keep their list placement.
+- Documents containing `$&`-style sequences in diagram labels render exactly;
+  Windows drive-letter image paths resolve as local files; malformed
+  percent-encoded image URLs degrade gracefully instead of failing the run.
+- Per-side margins (`--margin-left` etc.) are honored on documents containing
+  landscape pages.
+
+#### For contributors
+- 68 new free-tier gates (fence extraction, image policy, landscape promotion
+  with negative fixtures, format contracts, bundle drift) plus a paid gate-tier
+  /diagram triplet test and a periodic authoring-quality judge.
+- make-pdf-gate CI now covers `lib/diagram-render/**` and the drift test; the
+  committed bundle is pinned to LF in .gitattributes.
+- Fixed the `operational-learning` E2E fixture (bin scripts now ship with the
+  lib module they import).
+
 ## [1.57.10.0] - 2026-06-10
 
 ## **Codex review now runs by default everywhere it matters.**
diff --git a/VERSION b/VERSION
index e535f0937..3a62339b5 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.57.10.0
+1.58.0.0
diff --git a/package.json b/package.json
index 031944cb5..b2f92dd5a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "gstack",
-  "version": "1.57.10.0",
+  "version": "1.58.0.0",
   "description": "Garry's Stack — Claude Code skills + fast headless browser. One repo, one install, entire AI engineering workflow.",
   "license": "MIT",
   "type": "module",