build(release): publish releases to Gitea (code.m3ta.dev) instead of GitHub

Removes the release.github block — target and credentials come from
GITEA_URL/GITEA_TOKEN env. Pins the archive name_template to
agent-lib_<os>_<arch> so fleet download URLs stay predictable.

.goreleaser.yaml

@@ -2,6 +2,12 @@ version: 2
 
 project_name: agent-lib
 
+# Releases gehen an die eigene Gitea-Instanz (NICHT GitHub):
+#   GITEA_URL=https://code.m3ta.dev
+#   GITEA_TOKEN=<token mit repository-write>
+# Repo/Owner werden aus dem origin-Remote abgeleitet
+# (gitea@code.m3ta.dev:m3tam3re/agent-lib.git).
+
 before:
   hooks:
     - go mod tidy
@@ -33,11 +39,11 @@ archives:
     format_overrides:
       - goos: windows
         formats: [zip]
+    # Explizit stabil, damit Fleet-Download-URLs vorhersehbar bleiben:
+    # .../releases/download/<tag>/agent-lib_<os>_<arch>.<ext>
+    name_template: "{{ .ProjectName }}_{{ .Os }}_{{ .Arch }}"
 
 release:
-  github:
-    owner: m3tam3re
-    name: agent-lib
   draft: false
   prerelease: auto
   mode: append