Gate the gesture vocabulary the way the matrix is gated

Three holes, all found by the gate catching itself out.

**Prose that mentions the tag was read as a tag.** `dr-ui`'s module list
carries a comment saying where the generated table comes from, and it
names `GESTURE:` in passing; the scan extracted that sentence fragment as
a gesture with no place and no way to perform it. A tag must now *open*
its comment. A line that merely mentions it is describing the mechanism,
not declaring a member of it, and position is the only thing that tells
the two apart — which also makes the string-literal guard fall out for
free rather than being a special case.

**Neither artefact was regenerated on commit.** They cite line numbers,
so they go stale on anything that moves a line — the sheet commit made
the document wrong about every gesture in `library.slint` without
touching a single one. The pre-commit hook that already keeps the matrix
in step now keeps these too, and unlike the matrix it *fails* rather than
shrugging when the scan does: a matrix that will not build leaves a stale
one in place, where a malformed gesture block means a user about to be
told the wrong thing.

**CI did not check them at all.** It does now, blocking. The matrix is
read; the gesture table is *shown to somebody using the application*, and
a stale one tells them to perform a gesture that no longer exists — from
which they will conclude the application is broken rather than the page.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

docs/gestures.md

@@ -54,7 +54,7 @@ The right match confidence is a property of your library, not of the model. "Wha
 
 Touch has no ctrl, so without a mode there is no way to select a second photograph — the first tap would open it. The hold is the fast way in and the button is the one that can be found.
 
-<sub>`ui/dr-ui/ui/library.slint:1259`</sub>
+<sub>`ui/dr-ui/ui/library.slint:1282`</sub>
 
 ### Add or remove one photograph
 
@@ -63,7 +63,7 @@ Touch has no ctrl, so without a mode there is no way to select a second photogra
 
 While selecting, a tap never opens. That is the whole point of the mode: one meaning per gesture at a time. Press Done to get tap-to-open back.
 
-<sub>`ui/dr-ui/ui/library.slint:1268`</sub>
+<sub>`ui/dr-ui/ui/library.slint:1291`</sub>
 
 ### Leave selecting
 
@@ -71,7 +71,7 @@ While selecting, a tap never opens. That is the whole point of the mode: one mea
 - **Pointer** — Press Done in the header
 - **Keyboard** — Escape
 
-<sub>`ui/dr-ui/ui/library.slint:1276`</sub>
+<sub>`ui/dr-ui/ui/library.slint:1299`</sub>
 
 ### Select a range
 
@@ -80,7 +80,7 @@ While selecting, a tap never opens. That is the whole point of the mode: one mea
 
 This replaced a double tap, which had no visible state and could take forty photographs by accident. The run is resolved by the catalog rather than by what is on screen, so the grid can scroll between the two taps — the ranges that hurt on a tablet are longer than a screenful, which is exactly where a finger sweep runs out.
 
-<sub>`ui/dr-ui/ui/library.slint:1337`</sub>
+<sub>`ui/dr-ui/ui/library.slint:1360`</sub>
 
 ### Find photographs with two people in them
 
@@ -89,7 +89,7 @@ This replaced a double tap, which had no visible state and could take forty phot
 
 "Any of them" is a union and "all of them" is an intersection. The tray is where both terms and the choice between them live, because a filter belongs on the filter bar.
 
-<sub>`ui/dr-ui/ui/library.slint:2076`</sub>
+<sub>`ui/dr-ui/ui/library.slint:2101`</sub>
 
 ### Drop the selection but keep selecting
 
@@ -98,7 +98,7 @@ This replaced a double tap, which had no visible state and could take forty phot
 
 Distinct from Done, which leaves the mode entirely. Clearing keeps it, so the next selection can start straight away.
 
-<sub>`ui/dr-ui/ui/library.slint:2367`</sub>
+<sub>`ui/dr-ui/ui/library.slint:2392`</sub>
 
 ### Select everything the grid is showing
 
@@ -107,7 +107,7 @@ Distinct from Done, which leaves the mode entirely. Clearing keeps it, so the ne
 
 A scoped grid of two hundred frames is two hundred taps otherwise, and "all of them, except those three" is a far more common shape than the taps it took to say it.
 
-<sub>`ui/dr-ui/ui/library.slint:2384`</sub>
+<sub>`ui/dr-ui/ui/library.slint:2409`</sub>
 
 ### Resize the thumbnails
 
@@ -116,7 +116,7 @@ A scoped grid of two hundred frames is two hundred taps otherwise, and "all of t
 
 There is no wheel on a tablet, so without the pinch the cell size could only be changed by a control a finger cannot reach.
 
-<sub>`ui/dr-ui/ui/library.slint:2825`</sub>
+<sub>`ui/dr-ui/ui/library.slint:2850`</sub>
 
 ### File photographs in a collection
 
@@ -125,7 +125,7 @@ There is no wheel on a tablet, so without the pinch the cell size could only be
 
 The selection is what the drag carries, which is why selecting several is worth the mode: forty photographs file in one gesture.
 
-<sub>`ui/dr-ui/ui/library.slint:2974`</sub>
+<sub>`ui/dr-ui/ui/library.slint:2999`</sub>
 
 ### Open a photograph
 
@@ -134,7 +134,7 @@ The selection is what the drag carries, which is why selecting several is worth
 
 A tap opens; a tap that *moved* does not. Travel is what separates a deliberate tap from a hand brushing past, and it is the only thing that does: the two are the same length. An earlier version required the finger to dwell 120 ms instead, and that rejected ordinary taps — a real tap is often quicker than a brush.
 
-<sub>`ui/dr-ui/ui/library.slint:3204`</sub>
+<sub>`ui/dr-ui/ui/library.slint:3229`</sub>
 
 ### Rate a photograph without opening it
 
@@ -144,4 +144,4 @@ A tap opens; a tap that *moved* does not. Travel is what separates a deliberate
 
 A star has to take the press without it also reaching the cell, or every rating throws the user into develop.
 
-<sub>`ui/dr-ui/ui/library.slint:3316`</sub>
+<sub>`ui/dr-ui/ui/library.slint:3341`</sub>

docs/traceability.md

@@ -121,7 +121,7 @@ _None._
 | FR-UI-1 | [`ui/dr-ui/src/lib.rs:3172`](../ui/dr-ui/src/lib.rs#L3172), [`ui/dr-ui/src/lib.rs:89`](../ui/dr-ui/src/lib.rs#L89), [`ui/dr-ui/src/masks_ui.rs:816`](../ui/dr-ui/src/masks_ui.rs#L816), [`ui/dr-ui/ui/identity.slint:181`](../ui/dr-ui/ui/identity.slint#L181), [`ui/dr-ui/ui/library.slint:1099`](../ui/dr-ui/ui/library.slint#L1099) |
 | FR-UI-2 | [`ui/dr-ui/src/collections_ui.rs:1002`](../ui/dr-ui/src/collections_ui.rs#L1002), [`ui/dr-ui/src/collections_ui.rs:1012`](../ui/dr-ui/src/collections_ui.rs#L1012), [`ui/dr-ui/src/collections_ui.rs:119`](../ui/dr-ui/src/collections_ui.rs#L119), [`ui/dr-ui/src/collections_ui.rs:1495`](../ui/dr-ui/src/collections_ui.rs#L1495), [`ui/dr-ui/src/collections_ui.rs:1509`](../ui/dr-ui/src/collections_ui.rs#L1509), [`ui/dr-ui/src/collections_ui.rs:160`](../ui/dr-ui/src/collections_ui.rs#L160), [`ui/dr-ui/src/collections_ui.rs:1761`](../ui/dr-ui/src/collections_ui.rs#L1761), [`ui/dr-ui/src/collections_ui.rs:2812`](../ui/dr-ui/src/collections_ui.rs#L2812), [`ui/dr-ui/src/collections_ui.rs:486`](../ui/dr-ui/src/collections_ui.rs#L486), [`ui/dr-ui/src/gestures.rs:1`](../ui/dr-ui/src/gestures.rs#L1), [`ui/dr-ui/src/lib.rs:89`](../ui/dr-ui/src/lib.rs#L89), [`ui/dr-ui/src/lib.rs:96`](../ui/dr-ui/src/lib.rs#L96), [`ui/dr-ui/src/library_ui.rs:308`](../ui/dr-ui/src/library_ui.rs#L308), [`ui/dr-ui/src/library_ui.rs:5394`](../ui/dr-ui/src/library_ui.rs#L5394), [`ui/dr-ui/src/library_ui.rs:5539`](../ui/dr-ui/src/library_ui.rs#L5539), [`ui/dr-ui/src/library_ui.rs:6744`](../ui/dr-ui/src/library_ui.rs#L6744), [`ui/dr-ui/ui/adjust.slint:1072`](../ui/dr-ui/ui/adjust.slint#L1072), [`ui/dr-ui/ui/adjust.slint:544`](../ui/dr-ui/ui/adjust.slint#L544), [`ui/dr-ui/ui/adjust.slint:741`](../ui/dr-ui/ui/adjust.slint#L741), [`ui/dr-ui/ui/app.slint:2119`](../ui/dr-ui/ui/app.slint#L2119), [`ui/dr-ui/ui/app.slint:530`](../ui/dr-ui/ui/app.slint#L530), [`ui/dr-ui/ui/app.slint:537`](../ui/dr-ui/ui/app.slint#L537), [`ui/dr-ui/ui/app.slint:58`](../ui/dr-ui/ui/app.slint#L58), [`ui/dr-ui/ui/app.slint:888`](../ui/dr-ui/ui/app.slint#L888), [`ui/dr-ui/ui/controls.slint:474`](../ui/dr-ui/ui/controls.slint#L474), [`ui/dr-ui/ui/develop.slint:223`](../ui/dr-ui/ui/develop.slint#L223), [`ui/dr-ui/ui/gestures.slint:1`](../ui/dr-ui/ui/gestures.slint#L1), [`ui/dr-ui/ui/histogram.slint:127`](../ui/dr-ui/ui/histogram.slint#L127), [`ui/dr-ui/ui/history.slint:118`](../ui/dr-ui/ui/history.slint#L118), [`ui/dr-ui/ui/library.slint:1267`](../ui/dr-ui/ui/library.slint#L1267), [`ui/dr-ui/ui/library.slint:1274`](../ui/dr-ui/ui/library.slint#L1274), [`ui/dr-ui/ui/library.slint:1337`](../ui/dr-ui/ui/library.slint#L1337), [`ui/dr-ui/ui/library.slint:2692`](../ui/dr-ui/ui/library.slint#L2692), [`ui/dr-ui/ui/library.slint:3828`](../ui/dr-ui/ui/library.slint#L3828), [`ui/dr-ui/ui/library.slint:850`](../ui/dr-ui/ui/library.slint#L850), [`ui/dr-ui/ui/library.slint:906`](../ui/dr-ui/ui/library.slint#L906), [`ui/dr-ui/ui/masks.slint:314`](../ui/dr-ui/ui/masks.slint#L314), [`ui/dr-ui/ui/peaking.slint:82`](../ui/dr-ui/ui/peaking.slint#L82), [`ui/dr-ui/ui/presets.slint:19`](../ui/dr-ui/ui/presets.slint#L19), [`ui/dr-ui/ui/settings.slint:110`](../ui/dr-ui/ui/settings.slint#L110), [`ui/dr-ui/ui/spots.slint:88`](../ui/dr-ui/ui/spots.slint#L88) |
 | FR-UI-3 | [`ui/dr-ui/src/develop.rs:2224`](../ui/dr-ui/src/develop.rs#L2224), [`ui/dr-ui/src/develop.rs:2333`](../ui/dr-ui/src/develop.rs#L2333), [`ui/dr-ui/src/library_ui.rs:4503`](../ui/dr-ui/src/library_ui.rs#L4503), [`ui/dr-ui/src/masks_ui.rs:218`](../ui/dr-ui/src/masks_ui.rs#L218), [`ui/dr-ui/src/masks_ui.rs:908`](../ui/dr-ui/src/masks_ui.rs#L908), [`ui/dr-ui/src/masks_ui.rs:930`](../ui/dr-ui/src/masks_ui.rs#L930), [`ui/dr-ui/src/spots_ui.rs:19`](../ui/dr-ui/src/spots_ui.rs#L19), [`ui/dr-ui/ui/app.slint:1935`](../ui/dr-ui/ui/app.slint#L1935), [`ui/dr-ui/ui/collections.slint:4`](../ui/dr-ui/ui/collections.slint#L4), [`ui/dr-ui/ui/collections.slint:682`](../ui/dr-ui/ui/collections.slint#L682), [`ui/dr-ui/ui/masks.slint:524`](../ui/dr-ui/ui/masks.slint#L524) |
-| FR-UI-4 | [`tools/traceability/src/gestures.rs:1`](../tools/traceability/src/gestures.rs#L1), [`tools/traceability/src/gestures.rs:365`](../tools/traceability/src/gestures.rs#L365), [`ui/dr-ui/src/collections_ui.rs:1002`](../ui/dr-ui/src/collections_ui.rs#L1002), [`ui/dr-ui/src/collections_ui.rs:1012`](../ui/dr-ui/src/collections_ui.rs#L1012), [`ui/dr-ui/src/collections_ui.rs:119`](../ui/dr-ui/src/collections_ui.rs#L119), [`ui/dr-ui/src/collections_ui.rs:132`](../ui/dr-ui/src/collections_ui.rs#L132), [`ui/dr-ui/src/collections_ui.rs:1495`](../ui/dr-ui/src/collections_ui.rs#L1495), [`ui/dr-ui/src/collections_ui.rs:1509`](../ui/dr-ui/src/collections_ui.rs#L1509), [`ui/dr-ui/src/collections_ui.rs:160`](../ui/dr-ui/src/collections_ui.rs#L160), [`ui/dr-ui/src/collections_ui.rs:1625`](../ui/dr-ui/src/collections_ui.rs#L1625), [`ui/dr-ui/src/collections_ui.rs:1761`](../ui/dr-ui/src/collections_ui.rs#L1761), [`ui/dr-ui/src/collections_ui.rs:1788`](../ui/dr-ui/src/collections_ui.rs#L1788), [`ui/dr-ui/src/collections_ui.rs:1887`](../ui/dr-ui/src/collections_ui.rs#L1887), [`ui/dr-ui/src/collections_ui.rs:2812`](../ui/dr-ui/src/collections_ui.rs#L2812), [`ui/dr-ui/src/collections_ui.rs:486`](../ui/dr-ui/src/collections_ui.rs#L486), [`ui/dr-ui/src/collections_ui.rs:560`](../ui/dr-ui/src/collections_ui.rs#L560), [`ui/dr-ui/src/gesture_book.rs:3`](../ui/dr-ui/src/gesture_book.rs#L3), [`ui/dr-ui/src/gestures.rs:1`](../ui/dr-ui/src/gestures.rs#L1), [`ui/dr-ui/src/library_ui.rs:4503`](../ui/dr-ui/src/library_ui.rs#L4503), [`ui/dr-ui/src/library_ui.rs:4515`](../ui/dr-ui/src/library_ui.rs#L4515), [`ui/dr-ui/src/library_ui.rs:4567`](../ui/dr-ui/src/library_ui.rs#L4567), [`ui/dr-ui/src/library_ui.rs:4670`](../ui/dr-ui/src/library_ui.rs#L4670), [`ui/dr-ui/src/library_ui.rs:4698`](../ui/dr-ui/src/library_ui.rs#L4698), [`ui/dr-ui/src/library_ui.rs:5527`](../ui/dr-ui/src/library_ui.rs#L5527), [`ui/dr-ui/src/library_ui.rs:5539`](../ui/dr-ui/src/library_ui.rs#L5539), [`ui/dr-ui/ui/app.slint:1775`](../ui/dr-ui/ui/app.slint#L1775), [`ui/dr-ui/ui/app.slint:506`](../ui/dr-ui/ui/app.slint#L506), [`ui/dr-ui/ui/app.slint:537`](../ui/dr-ui/ui/app.slint#L537), [`ui/dr-ui/ui/app.slint:622`](../ui/dr-ui/ui/app.slint#L622), [`ui/dr-ui/ui/gestures.slint:1`](../ui/dr-ui/ui/gestures.slint#L1), [`ui/dr-ui/ui/library.slint:1075`](../ui/dr-ui/ui/library.slint#L1075), [`ui/dr-ui/ui/library.slint:1242`](../ui/dr-ui/ui/library.slint#L1242), [`ui/dr-ui/ui/library.slint:1267`](../ui/dr-ui/ui/library.slint#L1267), [`ui/dr-ui/ui/library.slint:1274`](../ui/dr-ui/ui/library.slint#L1274), [`ui/dr-ui/ui/library.slint:1330`](../ui/dr-ui/ui/library.slint#L1330), [`ui/dr-ui/ui/library.slint:1337`](../ui/dr-ui/ui/library.slint#L1337), [`ui/dr-ui/ui/library.slint:2692`](../ui/dr-ui/ui/library.slint#L2692), [`ui/dr-ui/ui/library.slint:3828`](../ui/dr-ui/ui/library.slint#L3828), [`ui/dr-ui/ui/library.slint:850`](../ui/dr-ui/ui/library.slint#L850), [`ui/dr-ui/ui/library.slint:900`](../ui/dr-ui/ui/library.slint#L900), [`ui/dr-ui/ui/library.slint:906`](../ui/dr-ui/ui/library.slint#L906), [`ui/dr-ui/ui/library.slint:925`](../ui/dr-ui/ui/library.slint#L925) |
+| FR-UI-4 | [`tools/traceability/src/gestures.rs:1`](../tools/traceability/src/gestures.rs#L1), [`tools/traceability/src/gestures.rs:366`](../tools/traceability/src/gestures.rs#L366), [`ui/dr-ui/src/collections_ui.rs:1002`](../ui/dr-ui/src/collections_ui.rs#L1002), [`ui/dr-ui/src/collections_ui.rs:1012`](../ui/dr-ui/src/collections_ui.rs#L1012), [`ui/dr-ui/src/collections_ui.rs:119`](../ui/dr-ui/src/collections_ui.rs#L119), [`ui/dr-ui/src/collections_ui.rs:132`](../ui/dr-ui/src/collections_ui.rs#L132), [`ui/dr-ui/src/collections_ui.rs:1495`](../ui/dr-ui/src/collections_ui.rs#L1495), [`ui/dr-ui/src/collections_ui.rs:1509`](../ui/dr-ui/src/collections_ui.rs#L1509), [`ui/dr-ui/src/collections_ui.rs:160`](../ui/dr-ui/src/collections_ui.rs#L160), [`ui/dr-ui/src/collections_ui.rs:1625`](../ui/dr-ui/src/collections_ui.rs#L1625), [`ui/dr-ui/src/collections_ui.rs:1761`](../ui/dr-ui/src/collections_ui.rs#L1761), [`ui/dr-ui/src/collections_ui.rs:1788`](../ui/dr-ui/src/collections_ui.rs#L1788), [`ui/dr-ui/src/collections_ui.rs:1887`](../ui/dr-ui/src/collections_ui.rs#L1887), [`ui/dr-ui/src/collections_ui.rs:2812`](../ui/dr-ui/src/collections_ui.rs#L2812), [`ui/dr-ui/src/collections_ui.rs:486`](../ui/dr-ui/src/collections_ui.rs#L486), [`ui/dr-ui/src/collections_ui.rs:560`](../ui/dr-ui/src/collections_ui.rs#L560), [`ui/dr-ui/src/gesture_book.rs:3`](../ui/dr-ui/src/gesture_book.rs#L3), [`ui/dr-ui/src/gestures.rs:1`](../ui/dr-ui/src/gestures.rs#L1), [`ui/dr-ui/src/library_ui.rs:4503`](../ui/dr-ui/src/library_ui.rs#L4503), [`ui/dr-ui/src/library_ui.rs:4515`](../ui/dr-ui/src/library_ui.rs#L4515), [`ui/dr-ui/src/library_ui.rs:4567`](../ui/dr-ui/src/library_ui.rs#L4567), [`ui/dr-ui/src/library_ui.rs:4670`](../ui/dr-ui/src/library_ui.rs#L4670), [`ui/dr-ui/src/library_ui.rs:4698`](../ui/dr-ui/src/library_ui.rs#L4698), [`ui/dr-ui/src/library_ui.rs:5527`](../ui/dr-ui/src/library_ui.rs#L5527), [`ui/dr-ui/src/library_ui.rs:5539`](../ui/dr-ui/src/library_ui.rs#L5539), [`ui/dr-ui/ui/app.slint:1775`](../ui/dr-ui/ui/app.slint#L1775), [`ui/dr-ui/ui/app.slint:506`](../ui/dr-ui/ui/app.slint#L506), [`ui/dr-ui/ui/app.slint:537`](../ui/dr-ui/ui/app.slint#L537), [`ui/dr-ui/ui/app.slint:622`](../ui/dr-ui/ui/app.slint#L622), [`ui/dr-ui/ui/gestures.slint:1`](../ui/dr-ui/ui/gestures.slint#L1), [`ui/dr-ui/ui/library.slint:1075`](../ui/dr-ui/ui/library.slint#L1075), [`ui/dr-ui/ui/library.slint:1242`](../ui/dr-ui/ui/library.slint#L1242), [`ui/dr-ui/ui/library.slint:1267`](../ui/dr-ui/ui/library.slint#L1267), [`ui/dr-ui/ui/library.slint:1274`](../ui/dr-ui/ui/library.slint#L1274), [`ui/dr-ui/ui/library.slint:1330`](../ui/dr-ui/ui/library.slint#L1330), [`ui/dr-ui/ui/library.slint:1337`](../ui/dr-ui/ui/library.slint#L1337), [`ui/dr-ui/ui/library.slint:2692`](../ui/dr-ui/ui/library.slint#L2692), [`ui/dr-ui/ui/library.slint:3828`](../ui/dr-ui/ui/library.slint#L3828), [`ui/dr-ui/ui/library.slint:850`](../ui/dr-ui/ui/library.slint#L850), [`ui/dr-ui/ui/library.slint:900`](../ui/dr-ui/ui/library.slint#L900), [`ui/dr-ui/ui/library.slint:906`](../ui/dr-ui/ui/library.slint#L906), [`ui/dr-ui/ui/library.slint:925`](../ui/dr-ui/ui/library.slint#L925) |
 | FR-UI-5 | [`ui/dr-ui/src/collections_ui.rs:1`](../ui/dr-ui/src/collections_ui.rs#L1), [`ui/dr-ui/src/lib.rs:2609`](../ui/dr-ui/src/lib.rs#L2609), [`ui/dr-ui/src/lib.rs:3211`](../ui/dr-ui/src/lib.rs#L3211), [`ui/dr-ui/src/lib.rs:3396`](../ui/dr-ui/src/lib.rs#L3396), [`ui/dr-ui/src/masks_ui.rs:863`](../ui/dr-ui/src/masks_ui.rs#L863), [`ui/dr-ui/ui/app.slint:109`](../ui/dr-ui/ui/app.slint#L109), [`ui/dr-ui/ui/collections.slint:4`](../ui/dr-ui/ui/collections.slint#L4) |
 | FR-UI-6 | [`ui/dr-ui/ui/widgets.slint:1`](../ui/dr-ui/ui/widgets.slint#L1) |
 | FR-UI-7 | [`core/dr-pipeline/src/descriptor.rs:177`](../core/dr-pipeline/src/descriptor.rs#L177), [`core/dr-pipeline/src/framing.rs:385`](../core/dr-pipeline/src/framing.rs#L385) |