Add conflict tracing and pair-local repair

docs/conflict_trace.md

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+# Conflict Trace
+
+Generated at 2026-04-02T14:24:39-07:00 by `scripts/record_conflict_trace.py`.
+
+## example_07_large_scale_routing_no_warm_start
+
+Results: 10 valid / 10 reached / 10 total.
+
+| Stage | Iteration | Conflicting Nets | Conflict Edges | Completed Nets |
+| :-- | --: | --: | --: | --: |
+| iteration | 0 | 9 | 16 | 1 |
+| iteration | 1 | 8 | 12 | 2 |
+| iteration | 2 | 6 | 5 | 4 |
+| iteration | 3 | 4 | 2 | 6 |
+| iteration | 4 | 4 | 2 | 6 |
+| iteration | 5 | 4 | 2 | 6 |
+| restored_best |  | 4 | 2 | 6 |
+| final |  | 0 | 0 | 10 |
+
+Top nets by traced dynamic-collision stages:
+
+- `net_06`: 7
+- `net_07`: 7
+- `net_01`: 6
+- `net_00`: 5
+- `net_02`: 5
+- `net_03`: 4
+- `net_08`: 2
+- `net_09`: 2
+- `net_05`: 1
+
+Top net pairs by frequency:
+
+- `net_06` <-> `net_07`: 7
+- `net_00` <-> `net_01`: 5
+- `net_01` <-> `net_02`: 4
+- `net_00` <-> `net_02`: 3
+- `net_00` <-> `net_03`: 3
+- `net_02` <-> `net_03`: 3
+- `net_01` <-> `net_03`: 2
+- `net_06` <-> `net_08`: 2
+- `net_06` <-> `net_09`: 2
+- `net_07` <-> `net_08`: 2
+
+Top component pairs by frequency:
+
+- `net_06[2]` <-> `net_07[2]`: 6
+- `net_06[3]` <-> `net_07[2]`: 6
+- `net_06[1]` <-> `net_07[1]`: 6
+- `net_06[2]` <-> `net_07[1]`: 5
+- `net_00[2]` <-> `net_01[3]`: 4
+- `net_01[2]` <-> `net_02[2]`: 3
+- `net_01[2]` <-> `net_02[3]`: 3
+- `net_00[2]` <-> `net_01[2]`: 3
+- `net_07[3]` <-> `net_08[2]`: 2
+- `net_02[1]` <-> `net_03[1]`: 2
+