Feature: Knowledge decay / freshness scoring #32
Description
Use Case
Knowledge bases rot silently. Notes captured a year ago may be outdated, wrong, or irrelevant. No competitor actively fights knowledge decay — Forest should.
Nodes should age. Old, unvisited nodes get flagged for review or archival. Edge weights could decay over time, making stale connections weaker.
Current Workaround
None. All nodes are treated as equally fresh regardless of age or access.
Proposed Solution
- Track `last_accessed` timestamp on nodes (updated on read/search hit)
- `forest stale` — list nodes that haven't been accessed in N days
- `forest stale --review` — interactive triage: keep, archive, update, delete
- Optional: decay function on edge scores — edges between stale nodes lose weight over time
- Optional: freshness indicator in search results
Context
- Forest node: `d653` (roadmap), `8e3e` (competitive analysis)
- Competitive edge: NO PKM tool does this — genuinely novel