fix: postgres/psql cross-contamination, watchexec tag filter, meta assets

- postgres/psql: add asset_filter to separate assets from shared repo
  (bnnanet/postgresql-releases contains postgres-*, postgresql-*, psql-*)
- watchexec: change tag_prefix to version_prefixes so old plain-tagged
  releases (v1.20.6+) aren't filtered out — only strip the cli- prefix
- classify: add .minisig, b3sums, dist-manifest.json to IsMetaAsset
  filter to prevent checksum/signature files from leaking into cache

internal/classify/classify.go

@@ -214,7 +214,7 @@ func IsMetaAsset(name string) bool {
 		".txt",
 		".sha256", ".sha256sum", ".sha512", ".sha512sum",
 		".md5", ".md5sum", ".sig", ".asc", ".pem",
-		".sbom", ".spdx", ".json.sig", ".sigstore",
+		".sbom", ".spdx", ".json.sig", ".sigstore", ".minisig",
 		"_src.tar.gz", "_src.tar.xz", "_src.zip",
 		"-src.tar.gz", "-src.tar.xz", "-src.zip",
 		".d.ts", ".pub",
@@ -234,6 +234,7 @@ func IsMetaAsset(name string) bool {
 	}
 	for _, exact := range []string{
 		"install.sh", "install.ps1", "compat.json",
+		"b3sums", "dist-manifest.json",
 	} {
 		if lower == exact {
 			return true

postgres/releases.conf

@@ -1,3 +1,4 @@
 source = github
 owner = bnnanet
 repo = postgresql-releases
+asset_filter = postgres

psql/releases.conf

@@ -1,3 +1,4 @@
 source = github
 owner = bnnanet
 repo = postgresql-releases
+asset_filter = psql

watchexec/releases.conf

@@ -1,4 +1,4 @@
 source = github
 owner = watchexec
 repo = watchexec
-tag_prefix = cli-
+version_prefixes = cli-