dev: split changelog files and use dev changelog for -dev versions

docs/RELEASE.md

@@ -1,17 +1,21 @@
-# Release Flow (Main + Nightly)
+# Release Flow (Main + Nightly + Dev)
 
-This project uses two release channels:
+This project uses three release channels:
 
+- `dev`: playground for experiments
 - `nightly`: integration and test channel
 - `main`: stable channel
 
 ## Rules
 
-- Feature work goes to `nightly` only.
+- Experimental work goes to `dev`.
+- Feature work for release goes to `nightly`.
 - Promote from `nightly` to `main` with `--squash` only.
 - `main` version has no suffix (`0.1.60`).
 - `nightly` version uses `-nightly` and is always at least one patch higher than `main` (`0.1.61-nightly`).
+- `dev` version uses `-dev` (`0.1.62-dev`).
 - Keep changelogs split:
+  - `CHANGELOG-DEV.md`
   - `CHANGELOG-NIGHTLY.md`
   - `CHANGELOG.md`
 
@@ -40,5 +44,6 @@ Then:
 
 ## Local ZIPs (separated)
 
+- Dev ZIP output: `dist/local_zips/dev/`
 - Main ZIP output: `dist/local_zips/main/`
 - Nightly ZIP output: `dist/local_zips/nightly/`