feat: add session handoff guidance to seeded CLAUDE.md template

Advisory instructions to append a brief summary to notes.md before ending a session. Also update logs/ description from "reserved" to "automatic session snapshots".

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

internal/seed/templates.go

@@ -21,7 +21,18 @@ This workspace is scoped to a single task. Keep work focused on the task describ
 - notes.md — Task log (human/agent-managed)
 - context/ — Reference documents (user-managed)
 - output/ — Task deliverables and artifacts
-- logs/ — Session logs (reserved for future use)
+- logs/ — Session logs (automatic session snapshots)
+
+## Session Handoff
+
+Before ending a session, append a brief summary to notes.md with:
+
+- What was accomplished
+- Key decisions made
+- Open follow-ups or unfinished work
+- How to continue from here
+
+Keep it concise — a few bullet points is enough. This helps the developer (or a future session) resume without losing context.
 `, slug, category, workspacePath)
 }