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E09: Product documentation backlog (#101)
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# US09-05 — Automate Documentation Acceptance
Epic: [E09](../E09-documentation.md)
As a release owner, I want one gate that proves the documentation still describes the
application, so that a change to the code cannot quietly make the manuals wrong.
## Acceptance criteria
- One documented command runs every documentation check and retains its evidence, in the
shape the release and container gates already use.
- The gate fails when: an internal link or anchor is dead; a page is unreachable from the
index; an image is referenced but missing or present but unreferenced; a documented
setting, command, exit code, error code, or state does not exist in the code; a code
path exists that the documentation is required to cover and does not.
- The gate regenerates the screenshots and fails when a regenerated image no longer
matches the committed one beyond a stated tolerance, so a UI change that invalidates the
manual is a red build rather than a discovery months later.
- The gate renders every documentation page in a real browser and fails on any console
error or CSP violation, and asserts that `script-src` contains neither `'unsafe-eval'`
nor `'unsafe-inline'`.
- The checks run on a `phase_i` marker; CI runs the gate, and the earlier epic suites keep
running unchanged.
- The README and the application's documentation index point at each other, so neither is
the forgotten copy.
- Documentation stories are mapped in the story traceability matrix like every other
story.
## Automated tests
- The gate's own contract is testable without a browser: a seeded broken link, a missing
image, an undocumented error code, and a stale screenshot each fail it, and a clean tree
passes.
- The full documentation suite runs on `phase_i` in CI.
## Dependencies
- US09-01 through US09-04