docs: update GOER.md — 98/101 packages match, 3 known diffs remain

GOER.md

@@ -7,18 +7,20 @@
 - [x] install.sh 8-space padding, PowerShell rendering
 - [x] pg asset_filter: server-only assets (includes client)
 - [x] comparecache field-level diffs: os/arch/libc/ext/channel with equivalence matching
+- [x] Go dist: use API structured os/arch (illumos/solaris kept distinct)
+- [x] sass: bare arm → armv7 (Dart Sass convention, per releases.js)
+- [x] ffmpeg: Windows .gz → ext exe (gzipped bare executables, per releases.js)
+- [x] Go dist: keep bare arm as-is (matches production)
 
-## comparecache findings (real diffs after equivalence)
+## comparecache status: 3 remaining diffs (all understood)
 
-| Package | Field | Issue |
-|---------|-------|-------|
-| go | os | `illumos`/`solaris` → Go maps both to `sunos`, prod keeps distinct |
-| go | arch | bare `arm` ambiguous — Windows=arm64, FreeBSD/Plan9=armv6 |
-| sass | arch | bare `arm` = armv7 (Dart), Go defaults to armv6 |
-| ffmpeg | ext | Windows `.gz` = gzipped exe, prod says `exe` |
-| postgres | ext | legacy EDB: prod says `tar`, Go says `tar.gz` |
-| terraform | channel | `alpha` correctly detected by Go, prod misses it |
-| iterm2 | channel | old versions differ |
+| Package | Field | Count | Issue |
+|---------|-------|-------|-------|
+| iterm2 | channel | 11 | Old 3.0.x versions: prod=beta, Go=stable. Edge case in URL-path detection. |
+| postgres | ext | 2 | Legacy EDB: prod=tar, Go=tar.gz. normalize.js quirk. |
+| terraform | channel | 14 | Go correctly detects alpha, prod misses it. Production bug. |
+
+All other packages (98/101) have zero field-level disagreements.
 
 ## Question for Researcher