- wants_json: true only for an exact `application/json` entry with q > 0.
Absent, empty, wildcard, application/*, near misses, q=0 and malformed
headers all fall through to the 303.
- The four mark routes share one exit, _mark_done: 204 with no body for the
in-place client, otherwise _mark_redirect unchanged.
- back=view lands on /b/<name>/view?f=<rel>#rail, only for a media item of
this booth. It is built from the resolved rel and never echoed. Anything
else takes the no-`back` landing.
- tests/golden/r2_mark_303.json: 108 responses recorded from the PRE-R2
code (6 route cases x back absent|marks x 9 non-JSON Accepts), replayed
byte for byte (INV-4). Two mutations (q>=0, substring match) turn it red.
- The contract now states the q=0 rule.
Triaged, not adopted wholesale. Folded:
- Reviewing refreshes .viewed, as it already did. It is now stated, so the
two clocks cannot read as disagreeing.
- INV-4 is scoped to pre-R2 request shapes. back=view is the declared
exception.
- back=view lands on the review only for media items. Anything else falls
back to the booth page.
- In-place regions: every element whose content can depend on marks is a
region, including the rail counts, the filmstrip and the tape. The stage
never is.
- The script never re-POSTs. A lost response must not duplicate a note or
re-date an answer.
- The dangling "invariant 5" now points at the Booth's CLAUDE.md invariant 5.
- "M" is defined once. Needs-you is picks only. Every key is suppressed in
editable fields.
- The toggle and the narrow collapse are classified against INV-3.
- Every Booth state file is a dotfile, stated. So are "no generated
thumbnails" and the audio placeholder.
- The requirement wording is tightened, and C7 records the voice and emblem
rulings.
Ordinal is appended, not inserted. The quote() guard stays, and skipped
items take no ordinal. Empty Desk sections do not render; this carries
forward the negative half of the kept-lane pair. The 1:1 toggle is bound
only when the stage is an image.
PROPOSED. Ruled by the operator 2026-09-23 (flow: a_b, compare this_arc,
voice plain, emblem no). Compare is not in this contract; it follows as r3.
Seam-reviewed against the live module surfaces before the cross-frontier
contract panel returned. Four findings are folded in: Mark.created is a
string, the board is BOOTH_LINKS_BOARD, the bench-read error state, and an
unreadable marks file counting as needing the operator.
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