Sweep all .cshtml files for encoding corruption; add pre-commit guard

Replace all corruption variants with HTML entities across 226 view files:
- 3-char UTF-8-as-Win1252 sequences (ae-corruption)
- Standalone smart/curly quotes that break C# Razor expressions
- Partially re-corrupted variants where the 3rd byte was normalised to ASCII

tools/Fix-Encoding.ps1: re-runnable sweep; uses [char] code points so the
script itself never contains a literal non-ASCII character; supports -DryRun

.githooks/pre-commit: blocks commits containing the ae-corruption byte
signature (xc3xa2xe2x82xac); git core.hooksPath = .githooks so the
hook is repo-committed and active for all future work on this machine.

Build clean; 225 unit tests pass.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.githooks/pre-commit

@@ -0,0 +1,27 @@
+#!/bin/sh
+# Pre-commit hook: block commits containing corrupted Unicode in .cshtml files.
+#
+# All corruption variants start with the UTF-8 byte sequence for a-circumflex
+# followed by euro-sign (bytes C3 A2 E2 82 AC), which is the first two chars
+# of every known corruption pattern. Grep for that byte sequence in staged files.
+
+STAGED=$(git diff --cached --name-only | grep '\.cshtml$')
+if [ -z "$STAGED" ]; then
+    exit 0
+fi
+
+# $'\xc3\xa2\xe2\x82\xac' = UTF-8 bytes for a-circumflex + euro-sign
+CORRUPT=$(echo "$STAGED" | xargs grep -l $'\xc3\xa2\xe2\x82\xac' 2>/dev/null)
+
+if [ -n "$CORRUPT" ]; then
+    echo ""
+    echo "ERROR: Corrupted Unicode characters detected in staged .cshtml files:"
+    echo "$CORRUPT" | sed 's/^/  /'
+    echo ""
+    echo "Fix by running:  .\\tools\\Fix-Encoding.ps1"
+    echo "Then re-stage the files and commit again."
+    echo ""
+    exit 1
+fi
+
+exit 0