docs: bring the 0.1.0 changelog in line with what shipped

It still described route classes the CLI no longer shows, named the backend
in user-facing prose, and claimed all rendering happens in the cloud — which
stopped being true once Pages and Numbers started rendering locally.

Rewritten around what a reader gets: the matrix, then the handful of cases
where the output differs from a plain full-fidelity render.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: iguangfei

CHANGELOG.md

@@ -10,48 +10,56 @@ First release.
 
 ### Added
 
-- `deckrender <input>` renders PPTX, PPT, PDF, Keynote, DOCX, DOC, HTML, Markdown
-  and URLs to images or PDF; PPTX and PPT also render to video.
-- Route table with `direct`, `derived`, `passthrough` and `local` classes. Chained
-  routes report every backend task in `--json`'s `route` field.
-- `html` renders to video through `html2pptx → ppt2video`, verified end to end.
-- `.pages` and `.numbers` render through a zero-dependency local engine that
-  extracts the document's embedded first-page preview, since DeckOps has no
-  converter for either format. Both the single-file and directory-bundle shapes
-  iWork writes are accepted. `--format pdf` wraps the JPEG in a single-page PDF.
-- `not_implemented` error code for combinations that are planned but not built
-  (`.xlsx` to image/pdf, `.pdf` and `.key` to video). `deckrender formats` marks
-  these `soon`, so "not yet" is distinguishable from "never".
-- Page selection (`--pages`, `--page`), sizing (`--width`, `--scale`),
-  encoding (`--image-format png|jpg|webp`) and `--quality` presets.
+- `deckrender <input>` renders a document to images, PDF or video:
+
+  | Input               | → image | → pdf | → video |
+  | ------------------- | ------- | ----- | ------- |
+  | `.pptx` `.ppt`      | ✅      | ✅    | ✅      |
+  | `.pdf`              | ✅      | ✅    | 🕓      |
+  | `.key`              | ✅      | ✅    | 🕓      |
+  | `.docx` `.doc`      | ✅      | ✅    | —       |
+  | `.xlsx`             | 🕓      | 🕓    | —       |
+  | `.pages` `.numbers` | ✅      | ✅    | —       |
+  | `.html` and URLs    | ✅      | ✅    | ✅      |
+  | `.md`               | ✅      | —     | —       |
+
+- Input from a file, an `http(s)` URL, or stdin. iWork documents are accepted
+  both as a single file and as the directory bundle Finder shows as one document.
+- Page selection (`--pages`, `--page`), sizing (`--width`, `--scale`), encoding
+  (`--image-format png|jpg|webp`) and `--quality` presets.
 - Profiles: `web`, `presentation`, `print`, `thumbnail`.
-- Output layouts: directory, single file, templated frames, zip, stdout.
+- Output as a directory, a single file, numbered frames, a zip, or stdout.
 - `--json` result envelope, `--quiet`, `--verbose`, and exit codes 0/1/2/3.
-- Credentials shared with DeckHTML and DeckOps through `~/.deckflow/credentials`,
-  with a five-level resolution chain and `config list` source reporting.
-- Guest mode: rendering works with no credentials; a 401 triggers browser login
-  and retries the request.
-- Pluggable `RenderEngine` interface; the cloud engine over `@deckops/sdk` is the
-  only implementation in this release.
+- `deckrender formats` prints the support matrix; `--json` adds the detail
+  tooling needs.
+- Credentials shared with the other DeckFlow CLIs through
+  `~/.deckflow/credentials`, resolved through a five-level chain that
+  `deckrender config list` reports the source of.
+- Guest mode: rendering works with no credentials at all. A `401` triggers
+  browser login and retries the request.
 - Programmatic API (`render`, `createRenderer`) exported from the same package.
 
-### Verification
+### Notes
 
-- `scripts/conformance.mjs` renders every file in `tests/test-data/` through every
-  output format against the live backend and diffs the result against the
-  documented matrix. All 24 combinations match.
+- Pages and Numbers render the preview embedded in the document, which covers
+  the **first page only**. Everything else renders in full.
+- HTML to PDF and video is laid out as slides rather than by a browser. The
+  result carries a `caveat` in `--json` and a warning on stderr.
+- 🕓 combinations report `not_implemented` with a message naming what is
+  blocking them, so "not yet" is distinguishable from "never".
+- An option the backend cannot honour fails with `unsupported_option` instead of
+  being silently dropped — rendering something other than what was asked for is
+  worse than an error. Values inherited from a profile or config file are the
+  exception: those are dropped with a warning.
+- `--fps`, `--duration` and `--transition` are not accepted yet; there are no
+  video parameters to map them onto.
 
-### Notes
+### Verification
 
-- Options the backend cannot honour fail with `unsupported_option` rather than
-  being silently ignored. Values inherited from a profile or config file are
-  dropped with a warning instead.
-- There is no `--mode` flag. Rendering runs in the DeckFlow cloud. The
-  `RenderEngine` interface is in place for the local engine, but a switch with
-  only one working position is not worth exposing.
-- `html -> pdf` routes through PPTX and carries a fidelity caveat. A native path
-  arrives with the local engine.
-- `--fps`, `--duration` and `--transition` fail: the backend video task accepts
-  no parameters.
+Every combination in the matrix above was confirmed end to end against the live
+backend by `scripts/conformance.mjs`, which renders real documents through every
+output and diffs the result against the documented matrix. Several conversions
+that looked plausible from the type definitions turned out not to work, so the
+matrix reflects measurement rather than inference.
 
 [0.1.0]: https://github.com/deckflow/deckrender/releases/tag/v0.1.0