Ship remaining PCB plan slices: BOM chain, SPOF, EMI FACT, gated Tj.

Package/pinout/ratings mismatches, SPOF as REVIEW, EMI only with a
datasheet quote, and Tj from copper+vias+θJA when every parameter exists.
Re-extract SI layout_rules from 1.12.0; ImpedenceFinder license stays UNKNOWN.

vendor/impedancefinder/SOURCE.md

@@ -5,6 +5,13 @@ Commit: a0c8d0ec37c9a1b099082926e50a245778ec8d6e
 Included: closed-form core (`zsolver`, `geometry`, `planes`, `model`,
 `net_walk`, `net_analysis`, `report`).
 
+**License: UNKNOWN.** Upstream
+https://github.com/manvalan/ImpedenceFinder at commit
+`a0c8d0ec37c9a1b099082926e50a245778ec8d6e` has **no LICENSE file**
+(HTTP 404 on `/LICENSE`). Periscope does **not** invent a license text
+in-tree. Confirm with the copyright holder before commercial
+redistribution of `vendor/impedancefinder`.
+
 Excluded on purpose:
 - `gerber2ems_export.py`, `prepare_simulation.py`, `crop_board.py`,
   `simulate_net.sh` (OpenEMS / field-solver export)