Bring the README, the docs index and CONTRIBUTING up to 0.17.0

The README said export went "to a folder here or back into the
library", which albums replaced and forbid, and called presets "named
presets" beside a shipped collection of film looks and Lightroom
imports. It now says both, and that a photograph only on the server
opens on its thumbnail with its download's progress. The requirement
count comes from traceability.md's summary: 192, 84% claimed; the
version and release count are left to the release commit.

docs/README.md's manual row gains presets and albums. CONTRIBUTING
said 177 requirements and 826 crates, and the Flatpak manifest 826
crates; the lockfile now holds 849 packages, 822 from the registry.

README.md

@@ -15,14 +15,15 @@ is still missing.
 **A library.** Point it at a folder — on this machine, on a network mount,
 or one a Nextcloud client keeps in virtual-files mode, where a placeholder
 is treated as the photograph rather than as a one-byte file — or at a
-Nextcloud account directly. The grid is virtualised, ordered by capture
-time with a timeline beside it, and filtered by rating, flag, colour label,
-person and whether the file is here. Ratings, colour labels, keywords,
-collections and a trash that survives a crash mid-operation. Card ingest.
-Bursts fold. The same RAW catalogued twice — a dated folder and a backup
-beside it — is found, proved the same, and folded onto one copy with the
-spares in the trash. Face detection and identity, with the index syncing
-between devices.
+Nextcloud account directly; a photograph that is only on the server opens on
+its thumbnail with the download's progress over it. The grid is virtualised,
+ordered by capture time with a timeline beside it, and filtered by rating,
+flag, colour label, person and whether the file is here. Ratings, colour
+labels, keywords, collections and a trash that survives a crash
+mid-operation. Card ingest. Bursts fold. The same RAW catalogued twice — a
+dated folder and a backup beside it — is found, proved the same, and folded
+onto one copy with the spares in the trash. Face detection and identity,
+with the index syncing between devices.
 
 **Developing.** Eighteen declared operations fused into one compute
 dispatch, plus the neighbourhood work that cannot be: clarity, texture,
@@ -31,7 +32,10 @@ simulation. Crop, straighten and correct converging verticals, spot repair,
 and local adjustments over masks the model draws — click a subject or a
 category, then paint, subtract a gradient or keep only where two selections
 agree, grow or shrink the edge. Focus peaking and a raw histogram for judging
-what is recoverable. Named presets; XMP sidecars other editors read.
+what is recoverable. Presets, with a collection shipped in the application —
+everyday corrections, and a look for each measured colour, cinema and
+black-and-white stock — and Lightroom presets imported as looks that leave a
+photograph's own corrections alone. XMP sidecars other editors read.
 
 [![Segmenting an urban scene and choosing the sky as a mask](docs/manual/media/local-segment.png)](docs/manual/README.md#local-adjustments)
 
@@ -49,8 +53,10 @@ binds it, and links them to the sections of the manual that show them — the
 manual ships with the application and opens offline.
 
 **Export.** JPEG, PNG, AVIF, JPEG XL, 8- and 16-bit TIFF, with resize, output
-sharpening, a naming template and a colour space — to a folder here or back
-into the library.
+sharpening, a naming template and a colour space — into albums: named export
+folders on this machine or on the server, never inside the library, which
+remember the photograph behind each file and sync between devices as
+collections do.
 
 **On both platforms.** The same core runs on a desktop and a 12-inch
 tablet; the interface is one layout, tuned for a wide viewport with touch
@@ -87,7 +93,7 @@ controls, its place in the chain and its tests.
 
 ## Where it stands
 
-**0.16.0**, twenty-four tagged releases in. 191 numbered requirements in
+**0.16.0**, twenty-four tagged releases in. 192 numbered requirements in
 scope, 84% of them claimed by code and [traced to it](docs/dev/traceability.md);
 the rest are written down rather than merely absent.