Mark stale projects with 🧊, remove archived entries, add Arcane (#1267)

- Add 🧊 marker for 113 stale projects (2+ years inactive)
- Remove 4 archived repos (Centurion, notary, Minio, docker-ls)
- Remove 1 broken link (docker-lock / safe-waters)
- Add Arcane to the Web section
- Replace 💲 with 💴 across README and tooling
- Add 🧊 (MarkerStale) support to Go parser/linter
- Update CONTRIBUTING.md, PR template, issue template, and AGENTS.md

Closes #1260, relates to #1188, #1255

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

internal/linter/fixer.go

@@ -39,9 +39,11 @@ func FormatEntry(e parser.Entry) string {
 		case parser.MarkerAbandoned:
 			markers = append(markers, ":skull:")
 		case parser.MarkerPaid:
-			markers = append(markers, ":heavy_dollar_sign:")
+			markers = append(markers, ":yen:")
 		case parser.MarkerWIP:
 			markers = append(markers, ":construction:")
+		case parser.MarkerStale:
+			markers = append(markers, ":ice_cube:")
 		}
 	}
 	if len(markers) > 0 {

internal/parser/parser.go

@@ -23,8 +23,9 @@ var markerDefs = []struct {
 	marker Marker
 }{
 	{text: ":skull:", marker: MarkerAbandoned},
-	{text: ":heavy_dollar_sign:", marker: MarkerPaid},
+	{text: ":yen:", marker: MarkerPaid},
 	{text: ":construction:", marker: MarkerWIP},
+	{text: ":ice_cube:", marker: MarkerStale},
 }
 
 // ParseEntry parses a single markdown list line into an Entry.

internal/parser/parser_test.go

@@ -44,7 +44,7 @@ func TestParseEntryWithMarkers(t *testing.T) {
 }
 
 func TestParseEntryMultipleMarkers(t *testing.T) {
-	line := `- [SomeProject](https://example.com) - A project. :heavy_dollar_sign: :construction:`
+	line := `- [SomeProject](https://example.com) - A project. :yen: :construction:`
 	entry, err := ParseEntry(line, 1)
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
@@ -90,7 +90,7 @@ func TestParseDocument(t *testing.T) {
 
 ## Services
 
-- [ServiceC](https://example.com/c) - Does C. :heavy_dollar_sign:
+- [ServiceC](https://example.com/c) - Does C. :yen:
 `
 	doc, err := Parse(strings.NewReader(input))
 	if err != nil {

internal/parser/types.go

@@ -5,8 +5,9 @@ type Marker int
 
 const (
 	MarkerAbandoned Marker = iota // :skull:
-	MarkerPaid                    // :heavy_dollar_sign:
+	MarkerPaid                    // :yen:
 	MarkerWIP                     // :construction:
+	MarkerStale                   // :ice_cube:
 )
 
 // Entry is a single link entry in the README.