export: export run writes selected kb/ pages as a derived, read-only version into configured target folders (markdown and command handlers, manifest, after_publish), raw accept also refuses manifest-listed files, doctor checks the section (#214); 10.0.0-beta.13

Files changed:
- CHANGES.md
- VERSION
- docs/how-to/README.md
- docs/how-to/back-up-to-a-synced-folder.md
- docs/how-to/collect-from-a-synced-folder.md
- docs/how-to/export-guidelines.md
- docs/how-to/export-to-a-synced-folder.md
- docs/reference/commands/README.md
- docs/reference/commands/exports.md
- docs/reference/commands/git.md
- docs/reference/commands/guideline-export.md
- docs/reference/commands/instance-health.md
- docs/reference/commands/raw-material-and-uploads.md
- docs/reference/configuration.md
- docs/reference/exit-codes.md
- instructions/setup-instance.md
- raw/CONTRACT.md
- tools/CONTRACT.md
- tools/README.md
- tools/chemenu/backup.py
- tools/chemenu/cli_contract.py
- tools/chemenu/commands/doctor.py
- tools/chemenu/commands/export_cmd.py
- tools/chemenu/commands/git_publish.py
- tools/chemenu/commands/raw/_common.py
- tools/chemenu/commands/raw/accept.py
- tools/chemenu/commands/raw/capture.py
- tools/chemenu/config_shapes.py
- tools/chemenu/guideline_export.py
- tools/chemenu/page_export.py
- tools/chemenu/reference_doc.py
- tools/chemenu/repo_capture.py
- tools/chemenu/tests/test_config_shapes.py
- tools/chemenu/tests/test_export_run.py

Co-Authored-By: Claude Code <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

docs/reference/commands/raw-material-and-uploads.md

@@ -262,7 +262,7 @@ tools/wikitool raw capture --update raw/2026/10/service-docs
 - `--ref` is a branch name (`main`) or a tag pattern (`v*`, any of `*?[`), which names the newest matching tag by version order. It resolves to one commit - for an annotated tag, the commit it points at.
 - The commit is fetched by ref name, shallowly, into a bare cache repository per URL under `tools/.wikitool_capture/` (gitignored). Files are read from it as blobs, never through a checkout, so they are byte-identical to the repository's - no line-ending conversion, no filter.
 - `--path` globs (repeatable) select files by their path in the repository, as git's `:(glob)` pathspec does: `*`, `?` and `[...]` do not cross `/`; `**` as a whole segment spans any number of directories; a glob without wildcards also takes everything below it as a directory. Files keep their repository paths inside the bundle.
-- Never captured, each named in the output with its reason: a file whose first line starts with `<!-- wikitool:export`, a symlink, a submodule, a file over 25 MiB, a path with a segment starting with `.`, a file named `_capture.json`, and a Git LFS pointer.
+- Never captured, each named in the output with its reason: a file whose first line starts with `<!-- wikitool:export` or a leading frontmatter block with a `wikitool_export:` key, a symlink, a submodule, a file over 25 MiB, a path with a segment starting with `.`, a file named `_capture.json`, and a Git LFS pointer.
 - `incoming/<bundle>/_capture.json` records `schema`, `repo`, `ref`, `commit`, `paths`, `captured` (UTC), `fidelity`, `authority` and `files`. It is the only declaration that and how this instance follows the repository.
 - Only `ssh://`, `https://` and the scp form `user@host:path`; a URL with a password or token in it is refused, since the manifest is committed. Git runs with the host's own credentials and configuration, restricted to those protocols, and never prompts: a repository that asks for credentials is reported as unreachable. Each git call times out after 120 s.
 - `--update <raw-bundle>` takes URL, ref rule and globs from that bundle's manifest and writes the current state to `incoming/<same bundle name>/`; `--fidelity`/`--authority` default to the manifest's values, and passing one is the way to correct it.
@@ -477,7 +477,7 @@ tools/wikitool raw accept incoming/chemenu --replaces-bundle raw/2026/10/chemenu
 - `0` - success
 - `1` - raw accept: A file does not exist or is not directly in `incoming/`; two files in one call share a filename; a target path already exists; or a target path would be over the path budget (160 UTF-16 code units below the instance root)
 - `1` - raw accept incoming/<folder>: The folder is not directly in `incoming/`, is combined with another argument, `--page` or `--replaces`, holds no file, or holds a hidden entry, a symlink or a special file; a target path is over the budget; or the folder name is already occupied under `raw/`
-- `1` - A file - given directly, inside a folder, or as `--replaces`/`--replaces-bundle` material - is a guideline export: its first line, after an optional BOM, starts with `<!-- wikitool:export`
+- `1` - A file - given directly, inside a folder, or as `--replaces`/`--replaces-bundle` material - is an export of this wiki: it carries the export marker (a first line starting with `<!-- wikitool:export`, or a `wikitool_export:` key in a leading frontmatter block), or it is byte for byte a file in the manifest of a configured `export` target
 - `1` - raw accept: `--fidelity`/`--authority` is missing, or names `unknown` or a value outside the schema's enum
 - `1` - raw accept: The target name is already occupied anywhere under `raw/` by something the call does not own
 - `1` - raw accept: `--page` names an unknown page or one with no `raw_files:` yet, an existing `raw_files:` entry is missing on disk, a file to be moved has more than one owning page, or `--page` would overwrite an already-set `fidelity`/`authority` with a different value