v0.17.5: plane-repair safety, unified cleanup pipeline, obstacle/pad model fixes

Highlights since v0.17.4 (62 commits):
- #329: never ship net-destructive plane pad repairs; piece-level
  collision-checked restore on tap rip-up, for both route_planes and
  route_disconnected_planes
- #328: NPTH pads are not plated barrels (shared pad_is_plated_through gate)
- #319/#320: one shared post-route cleanup pipeline, uniform board==file
  contract, one coincidence primitive/tolerance, soft-joint bridging
- #309/#310: obstacle-map ref-count leak fixes across all four routing fronts
- #312: escape net names on write, killing phantom same-net-name shorts
- #324/#325: model pad drill/copper offset in both parsers
- #316/#327: kicad-cli DRC cross-check wired into stress replay grading
- #317: component-based multipoint routing
- GUI parity: diff-pair stale-copper strip + deferred-pair reporting,
  plane strip-and-replace, --no-clamp-netclasses

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012HY47S9XjHpmTDMmoL3BM5

Author: drandyhaas

VERSION

@@ -1 +1 @@
-0.17.4
+0.17.5

metadata.json

@@ -25,7 +25,7 @@
   ],
   "versions": [
     {
-      "version": "0.17.4",
+      "version": "0.17.5",
       "status": "testing",
       "kicad_version": "9.0",
       "runtime": "swig",
@@ -34,7 +34,7 @@
         "macos",
         "windows"
       ],
-      "download_url": "https://github.com/drandyhaas/KiCadRoutingTools/releases/download/v0.17.4/KiCadRoutingTools-0.17.4.zip",
+      "download_url": "https://github.com/drandyhaas/KiCadRoutingTools/releases/download/v0.17.5/KiCadRoutingTools-0.17.5.zip",
       "download_sha256": "0000000000000000000000000000000000000000000000000000000000000000",
       "download_size": 0,
       "install_size": 0