feat: add obsolete project notice for inactive projects

- Add warning notice for projects with avg commit age > 2 years AND last commit > 1 year
- Display "⚠️ Notice: This project appears to be finished, obsolete, or no longer maintained"
- Also update abandoned branch threshold from 1 to 3 years in branch analyzer
- Helps users identify potentially outdated or unmaintained projects

🤖 Generated with [Claude Code](https://claude.ai/code)

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

2 files changed, 17 insertions, 3 deletions

diff --git a/internal/showcase/showcase.go b/internal/showcase/showcase.go
index 60b0fb2..aa3e959 100644
--- a/internal/showcase/showcase.go
+++ b/internal/showcase/showcase.go
@@ -401,7 +401,20 @@ func (g *Generator) formatGemtext(summaries []ProjectSummary) string {
 			}
 			builder.WriteString(fmt.Sprintf("* Development Period: %s to %s\n", summary.Metadata.FirstCommitDate, summary.Metadata.LastCommitDate))
 			builder.WriteString(fmt.Sprintf("* Recent Activity: %.1f days (avg. age of last 42 commits)\n", summary.Metadata.AvgCommitAge))
-			builder.WriteString(fmt.Sprintf("* License: %s\n\n", summary.Metadata.License))
+			builder.WriteString(fmt.Sprintf("* License: %s\n", summary.Metadata.License))
+			
+			// Check if project might be obsolete (avg age > 2 years AND last commit > 1 year)
+			if summary.Metadata.AvgCommitAge > 730 && summary.Metadata.LastCommitDate != "" {
+				// Parse the last commit date
+				lastCommit, err := time.Parse("2006-01-02", summary.Metadata.LastCommitDate)
+				if err == nil {
+					daysSinceLastCommit := time.Since(lastCommit).Hours() / 24
+					if daysSinceLastCommit > 365 {
+						builder.WriteString("\n⚠️  **Notice**: This project appears to be finished, obsolete, or no longer maintained. Last meaningful activity was over 2 years ago. Use at your own risk.")
+					}
+				}
+			}
+			builder.WriteString("\n\n")
 		}
 		
 		// Handle images and paragraphs
diff --git a/internal/sync/branch_analyzer.go b/internal/sync/branch_analyzer.go
index c3b2204..f684f60 100644
--- a/internal/sync/branch_analyzer.go
+++ b/internal/sync/branch_analyzer.go
@@ -46,12 +46,13 @@ func (s *Syncer) analyzeAbandonedBranches() (*AbandonedBranchReport, error) {
 	if mainBranch != "" {
 		mainInfo, err := s.getBranchInfo(mainBranch)
 		if err == nil {
-			report.MainBranchUpdated = mainInfo.LastCommit.After(time.Now().AddDate(-1, 0, 0))
+			// Consider project active if main branch has commits within last 3 years
+			report.MainBranchUpdated = mainInfo.LastCommit.After(time.Now().AddDate(-3, 0, 0))
 			report.MainBranchLastCommit = mainInfo.LastCommit
 		}
 	}
 
-	// Only analyze if main branch is active
+	// Only analyze if main branch is active (has commits within last 3 years)
 	if !report.MainBranchUpdated {
 		return report, nil
 	}