Simplify session summary filename format

Changed filename from [PROJECT_NAME]-[HOSTNAME]-session-summary.md
to [HOSTNAME]-session-summary.md

Rationale:
- Session summary is saved inside project directory
- Project name in filename is redundant
- Simpler, cleaner filename
- No timestamp (overwrites each session)

Updated files:
- agents/finish-up.md: Updated filename format in Steps 1, 3, and 7
- CLAUDE.md: Updated agent naming convention and session history
- WORKFLOW.md: Updated agent behavior description

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

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

CLAUDE.md

@@ -57,7 +57,7 @@ This is a shared repository containing Claude Code agents that can be deployed a
 **Agent Naming Convention:**
 - Agent files: `agents/{agent-name}.md`
 - Invocation: Match the filename (e.g., "finish-up" agent)
-- Session files: `[PROJECT_NAME]-[HOSTNAME]-session-summary.md`
+- Session files: `[HOSTNAME]-session-summary.md`
 
 ### Technical Decisions
 
@@ -115,7 +115,7 @@ This is a shared repository containing Claude Code agents that can be deployed a
   - Created CLAUDE.md for future context preservation
 - **Key Decisions**:
   - No changes needed - all requested features already implemented
-  - Session summary filename format confirmed: `[PROJECT_NAME]-[HOSTNAME]-session-summary.md`
+  - Session summary filename format updated: `[HOSTNAME]-session-summary.md` (project name removed as redundant)
 - **Next Steps** (Prioritized):
   - Test Finish Up Agent on this VPS to verify proper operation
   - Consider deploying agents to additional VPS instances