The standing instruction is to re-count the booths before scoping U7. Done against the live 19-booth set, so the scope call is a short read rather than an investigation. Two findings. Sections are worth zero and it is now measured twice: not one of the eleven gallery booths has a subdirectory, and the only two booths that do are both reports, the job where grid navigation matters least. And the grouping signal is in the filename rather than the tree -- stripping a trailing digit-run yields 5 to 16 sensible groups on four of the five large galleries and degenerates to one group on the fifth, while the competing split-on-second- hyphen heuristic is useless everywhere. The sizing case has also moved: the unit was scoped against 270-item booths and the largest gallery is now 81 items / 40 images. No U7 code and no U7 contract. The scope direction is the operator's call.
71 lines
3.1 KiB
Markdown
71 lines
3.1 KiB
Markdown
# U7 re-measured before scoping — sections are dead, filename prefixes are not
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_2026-09-22 · booth_
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**Pre-work, not the unit.** The standing instruction is "re-count the booths
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before scoping U7". Done, on the live set (19 booths). No U7 code, no U7
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contract — this exists so the scope call is a thirty-second read.
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## The set as it actually is
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| booth | items | images | subdirs | shape |
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|---|---|---|---|---|
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| `miranda-is` | 92 | 0 | 0 | report |
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| `sindra-bakeoff` | 81 | 40 | **0** | gallery |
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| `sindra-corpus-v1` | 66 | 66 | **0** | gallery |
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| `sindra` | 61 | 30 | **0** | gallery |
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| `sindra-sfw-pool` | 59 | 59 | **0** | gallery |
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| `sindra-nude-pool` | 42 | 42 | **0** | gallery |
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| `pewpew-ui-brief` | 34 | 1 | 7 | **report** |
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| `dfa-concepts` | 21 | 14 | 1 | **report** |
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| …11 more | ≤19 | | 0 | |
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## Finding 1 — sections are worth ZERO, and this is now measured twice
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**Not one gallery booth has a subdirectory.** Zero of eleven. The only two
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booths with subfolders are both **reports**, the job where grid navigation
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matters least, and `pewpew-ui-brief`'s seven subdirs hold one image.
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The IA doc calls sections "most of the navigation fix". On this set they are
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none of it. Cutting `Item.section` rendering from U7 costs nothing measurable.
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(`Item.section` already exists from U1 and stays — this is about whether U7
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builds a section RAIL, not about deleting a field.)
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## Finding 2 — the grouping signal is in the FILENAME, and it pays
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Tested two heuristics against every large gallery. Strip a trailing digit-run
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from the stem and group on what remains:
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| booth | images | groups | verdict |
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|---|---|---|---|
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| `sindra-corpus-v1` | 66 | **16** | useful |
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| `sindra-nude-pool` | 42 | **12** | useful |
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| `sindra-sfw-pool` | 59 | **10** | useful |
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| `sindra-bakeoff` | 40 | **5** | useful |
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| `sindra` | 30 | **1** | **degenerates** |
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Specimens: `00-sheet-c1-market-noon.png`, `ac01.png`, `a01.png`,
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`flag-rear.png`. The competing heuristic — split on the second hyphen — is
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useless everywhere (59 "groups" from 59 files).
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So a prefix heuristic pays on **4 of 5** large galleries and collapses to one
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group on the fifth. **That is a filter/grouping affordance, not a section
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rail**, and it must degrade gracefully to "one group" rather than render a
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useless single-section rail.
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## What this implies for the scope, stated as a recommendation not a decision
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U7 as written is four things: sections, a sticky rail, filters, grid keyboard.
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The measurement says **drop sections, keep the other three**, and consider
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prefix-grouping as the thing sections were supposed to be — with a stated
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degenerate case.
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⚠ The sizing case has also changed: the unit was scoped against 270-item
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booths and **the largest gallery is now 81 items / 40 images**. Everything
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about virtualization stays parked ([[2026-09-21-ia-and-v1-gate-landed]] names
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it); at 66 images a lazy grid is fine and measuring it first is the rule.
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**The booth set churned again during this session** — `sindra-sfw-pool` (59
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images) appeared and the `pancake-*` set went. Re-count again before writing
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the contract; do not trust this table either.
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