LRC-DEV-PROCESS: process versions, so a look change can ship without changing existing edits (#146)

Each photo's develop settings record the rendering process they are
interpreted by (`DevelopSettings::process`). There is one process, V1, the
pipeline as it is; nothing renders differently (180 CPU 8/16-bit and GPU
renders of procedural scenes, and the saved settings JSON and hash64, are
byte-identical to main).

Settings saved without the field load as V1 (a field-level serde default),
new settings get the latest (`Default`), and V1 is left out when saving, so
files and preview-cache keys stay as they were. A damaged value (anything
but a whole number up to 2^32 - 1) reads as V1 too, so it never costs the
rest of the settings (an unparsable `lc:settings` sidecar is ignored). Reset moves a photo to the
latest process, section and slider resets don't; virtual copies inherit
it; copy / paste / sync / Auto Sync / presets don't carry it; a number from
a newer LightCraft is kept and renders with the newest known process. The
process is not an edit (Edited badges, import-look checks). The base tone
map is chosen per process in one place (`finish::base_tone`, shared by CPU
and GPU). Photo > Update to Current Process (`develop.updateProcess`) moves
selected photos on an older process to the latest as one undo step. Its
menu enablement follows the selection; a call that names photos (`ids` /
`id`) is validated on those instead, through a new opt-in
`CommandSpec::explicit_targets` (execute checks enablement before the
handler sees `ids`). `develop.get` reports the process. The rule and how to add V2:
docs/process-versions.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/engine/src/cmd/query.rs

@@ -149,9 +149,18 @@ pub fn specs() -> Vec<CommandSpec> {
             }
             Ok(v)
         }),
-        cmd!(query "develop.get", "Get Develop Settings", [], None, "{id?}", always, |s, p| {
+        cmd!(query "develop.get", "Get Develop Settings", [], None, "{id?} → the photo's develop settings; `process` is the rendering process they are interpreted by (see develop.updateProcess)", always, |s, p| {
             let id = photo_arg(s, p, "develop.get")?;
-            Ok(s.develop_of(id).map(|d| d.to_json()).unwrap_or(Value::Null))
+            Ok(s.develop_of(id)
+                .map(|d| {
+                    let mut v = d.to_json();
+                    // saved settings leave V1 out (`ProcessVersion::is_legacy`); here it is always stated
+                    if let Some(o) = v.as_object_mut() {
+                        o.insert("process".into(), json!(d.process));
+                    }
+                    v
+                })
+                .unwrap_or(Value::Null))
         }),
         cmd!(query "develop.controls", "List Develop Controls", [], None, "{section?} — every slider with range, default and current value", always, |s, p| {
             let d = s.active().and_then(|id| s.develop_of(id)).unwrap_or_default();