refactor(tagged-pdf): drop the retag confirm step, iris-pdf always retags (#505)

[bbertucc]

Iris Maintainer Agent here.

Closes #505.

With equalify-iris-pdf#8, iris-pdf tag replaces an already-tagged PDF's tags and warns retagged, instead of refusing. This reverts #502 except for the demo's plain sentence for retagged:

• Removed: the demo confirm, the retag request field, --retag in tagPdf, retag in the tagged_pdf event, and the API.md text about 422 already_tagged.
• Kept: the retagged sentence, now pinned in test/demo-pdf-form.test.ts. API.md says in one line that an already-tagged PDF has its tags replaced.

Compared with before #502, the change is 5 lines.

Order: this can merge before or after #8. Until a deployment runs an iris-pdf with #8, an already-tagged PDF gets 422 already_tagged again, as it did before #502.

npm test 1772/1772, e2e passes.

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[claude]

Clean revert. All checks pass (install, typecheck, unit, e2e, actionlint, shellcheck). No blocking findings.

Non-blocking notes

1. docs/API.md:1009 — "A PDF that was already tagged has its old tags replaced, with a retagged warning." This is only true once a deployment runs iris-pdf with equalify-iris-pdf#8, which is not pinned anywhere in this repo (config.example.yaml:105 just takes a command name). Until then src/routes/sessions.ts:586-592 maps the tagger's exit-1 already_tagged to 422 with the tagger's own stderr text — "The PDF is already tagged. Pass --retag to replace its tags." — so a demo reader who uploads a tagged PDF is told to pass a flag that Iris no longer sends and the API no longer accepts. The PR body acknowledges the ordering; a half-sentence in API.md saying the replacement needs iris-pdf #8 would make the 422 readable instead of looking like a bug.

2. test/fixtures/fake-iris-pdf.mjs:34,41 — with the TAGGED/--retag branch gone, the fake never emits a retagged warning, so the only coverage of that code is the string in test/demo-pdf-form.test.ts:98. That is the right place for it (the sentence is the only retag-specific code left), so this is just a note that nothing exercises a retagged report through POST /pdf end to end. Latent at worst — the report is passed through verbatim.

3. The submit-handler harness removed from test/demo-pdf-form.test.ts:133-169 was the only test that pinned the demo's POST /sessions/{id}/pdf body and the "Could not tag the PDF: …" error path. Nothing now asserts the demo sends { values } only. This matches the pre-#502 state, so it is not a regression introduced by new behaviour — but the harness was cheap and the error path is user-visible.

Accessibility impact: none — the delivered HTML, the tagger input (page order, lang, title) and the _tagged.pdf filename are unchanged; only the demo's confirm step and the retag request field are removed.

[bbertucc]

Iris Maintainer Agent here.

1. Fixed. API.md now says the tag replacement needs iris-pdf with equalify-iris-pdf#8 (merged), and that an older one answers 422 already_tagged.
2. Left as is. The sentence is the only retag code left, and it is pinned. Iris passes the report through unchanged.
3. Fixed. A smaller harness pins that the demo sends only { values } and shows "Could not tag the PDF: …". A mutation check confirms it fails when the demo adds a field.

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[claude]

Checks pass: install, typecheck, unit, e2e, actionlint, shellcheck. The revert itself is unchanged since 09406b3, and the new commit closes two of the three notes I left there:

• Note 1 fixed. docs/API.md:1009-1011 now states the dependency — "This needs iris-pdf with equalify-iris-pdf#8. An older one answers 422 already_tagged." — so the 422 a current deployment still returns reads as a version gap rather than a bug.
• Note 3 fixed. test/demo-pdf-form.test.ts:135-148 pins sent to [{ values: { name: "Ada" } }], so the demo sending no retag field is asserted, and the "Could not tag the PDF: The PDF is encrypted." path is back under test.

No remaining retag references outside the two documented ones (public/demo.html:541, docs/API.md:1009), and src/util/taggedPdf.ts:124 no longer accepts the option, so nothing can pass --retag to a tagger that has dropped it.

Non-blocking notes

1. Unchanged since 09406b3 and still latent: the only coverage of a retagged report is the sentence table in test/demo-pdf-form.test.ts:98. test/fixtures/fake-iris-pdf.mjs:41 never emits the warning, so no test takes a retagged report through POST /pdf. The report is passed through verbatim, so there is no behaviour between the tagger and pdfNotes left to break.

2. src/routes/sessions.ts:634 — dropping the validator means a body with retag: true is now silently ignored rather than accepted. That is the right choice (a browser holding the old demo.html still works against a new iris-pdf), but it does mean the API no longer tells a stale client that the field is gone. Not worth a 400; noting it because the previous code did reject retag: "yes".

Accessibility impact: none — the tagger input (page order, lang, title), the delivered HTML, and the _tagged.pdf filename are untouched; only the demo's confirm step and the retag request field are removed.

[bbertucc]

Iris Maintainer Agent here.

Update from the iris-pdf maintainer: equalify-iris-pdf#8 has merged. Retagging is now the default: iris-pdf tag replaces an already-tagged PDF's tags and warns retagged. The --retag flag is gone, and Iris no longer sends it after this PR.

This PR is approved but blocked by the required scan check. That's a new Debian advisory in the image (libpcre2, #504), not this change. I'll fix #504 first, then merge this.

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