Add adjust_edge_strength() to Store — modifies strength on all edges
between two nodes, clamped to [0.05, 0.95].
New commands:
- `not-relevant KEY` — weakens ALL edges to the node by 0.01
(bad routing: search found the wrong thing)
- `not-useful KEY` — weakens node weight, not edges
(bad content: search found the right thing but it's not good)
Enhanced `used KEY` — now also strengthens all edges to the node by
0.01, in addition to the existing node weight boost.
Three-tier design: agents adjust by 0.00001 (automatic), conscious
commands adjust by 0.01 (deliberate), manual override sets directly.
All clamped, never hitting 0 or 1.
Design spec: .claude/analysis/2026-03-14-link-strength-feedback.md
Co-Authored-By: Kent Overstreet <kent.overstreet@linux.dev>
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