Implement the distributor v0.5 PipelineID update

docs/integrations/distributor/pkg-bundle.md

@@ -19,7 +19,7 @@ Use `WriteBundle` when producer-generated files live outside the final bundle ro
 ```go
 manifest, err := bundle.WriteBundle(bundle.WriteBundleOptions{
 	Root: "/var/spool/distributor/weather/hourly-2026-06-07T15",
-	ID:   "weather.hourly.brentwood.2026-06-07T15",
+	ID:   "weather.hourly.brentwood",
 	Files: []bundle.BundleFile{
 		{SourcePath: "/tmp/weather/report.md", Path: "report.md"},
 		{SourcePath: "/tmp/weather/summary.txt", Path: "summary.txt"},
@@ -41,7 +41,7 @@ Use `BuildManifest` and `WriteManifest` when files are already staged under the
 root := "/var/spool/distributor/weather/hourly-2026-06-07T15"
 manifest, err := bundle.BuildManifest(bundle.BuildOptions{
 	Root:  root,
-	ID:    "weather.hourly.brentwood.2026-06-07T15",
+	ID:    "weather.hourly.brentwood",
 	Files: []string{"report.md", "summary.txt"},
 })
 if err != nil {
@@ -72,6 +72,8 @@ Invalid paths include:
 
 Explicit file lists preserve caller order. File order is part of the bundle digest, so producers should choose it deliberately and keep it stable.
 
+The manifest `ID` is the logical source identity used by `distributor` destination comparison. Keep it stable for runs that should replace the same managed destination artifact. If every run uses a different manifest `ID`, `distributor` treats those runs as different sources and may report a destination conflict instead of replacing older output.
+
 ## Validation And Digest Helpers
 
 Use `ValidateBundle` before handing an existing local bundle to another process. It verifies manifest semantics, file existence, regular-file type, file size, per-file SHA-256 digests, and bundle digest.