Add 0.10.0 milestone plan; trim ROADMAP to portable packaging

Add docs/RELEASE-0.10-PLAN.md covering the open roadmap follow-ups plus
per-job overlap policy, run-time statistics, one-line activity entries,
log-name fix, and 720p window sizing. Drop the non-portable delivery
formats (.deb, installer, AppImage, Flatpak, winget) from ROADMAP.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/RELEASE-0.10-PLAN.md

@@ -113,14 +113,18 @@ guarantee and does not have a clean per-job meaning).
   obsolete autostart-migration code, and noisy README setup notes now that 0.9.0
   has had field use. Recheck `.gitignore` / Docker / packaging ignore rules.
 
-## 7. Delivery and packaging (start the first variant)
+## 7. Delivery and packaging (portable only)
 
-Begin the packaging track from the roadmap rather than completing all of it:
+This milestone targets only the portable distribution variants, matching the
+ROADMAP delivery plan. Non-portable installer/package formats are out of scope and
+have been dropped from the roadmap.
 
 - Windows portable `.zip` bundling `gosentry.exe`, `README.md`, `CHANGELOG.md`
   (a `scripts\package-windows.*` helper).
-- Defer Linux `.tar.gz`, `.deb`, and the installer to a later milestone; leave the
-  per-user data-path design note in ROADMAP.
+- Linux portable `.tar.gz` for `linux-amd64` and `linux-arm64` bundling the
+  binary, `README.md`, and `CHANGELOG.md` (a `scripts/package-linux.*` helper).
+- Portable builds keep settings and jobs next to the executable — no per-user
+  data-path work is needed for this release.
 
 ## Implementation order
 
@@ -129,7 +133,7 @@ Begin the packaging track from the roadmap rather than completing all of it:
 3. §4 per-job overlap policy (domain → dispatch → dialog → tests).
 4. §5 window sizing.
 5. §6 jobs_view split + cleanup (after the §1/§2/§4 edits land).
-6. §7 Windows portable zip.
+6. §7 portable archives (Windows `.zip`, Linux `.tar.gz`).
 7. Version bump to `0.10.0` (`src/app/version.go`), CHANGELOG, ROADMAP tick-offs.
 
 ## Verification

docs/ROADMAP.md

@@ -45,22 +45,10 @@ Planned delivery variants:
 
 - Windows portable `.zip` with `gosentry.exe`, `README.md`, and `CHANGELOG.md`.
 - Linux portable `.tar.gz` archives for `linux-amd64` and `linux-arm64`.
-- Debian/Ubuntu `.deb` package once the Linux runtime paths are settled.
-- Windows installer later, likely Inno Setup first and MSI/WiX only if needed.
-- AppImage as a possible Linux GUI-friendly format after the core workflow is stable.
-- Flatpak only after the desktop integration story is clearer.
-- winget manifest after stable public Windows releases exist.
 
-Packaging design note:
-
-- Portable builds can keep settings and jobs next to the executable.
-- Installer/package builds should move runtime data to per-user locations:
-  `%APPDATA%\GoSentry` on Windows, and XDG directories such as
-  `~/.config/gosentry` and `~/.local/share/gosentry` on Linux.
+Portable builds keep settings and jobs next to the executable.
 
 Initial priority:
 
 1. Windows portable `.zip`.
 2. Linux portable `.tar.gz` for amd64 and arm64.
-3. Debian/Ubuntu `.deb`.
-4. Windows installer.