[aw] Refresh nightly fix finder categories

.github/workflows/nightly-fix-finder.md

@@ -21,8 +21,8 @@ on:
         - "03-region-directives"
         - "04-missing-xml-docs"
         - "05-general-mistakes"
-        - "06-unused-using-directives"
-        - "07-asynctask-log-property"
+        - "06-completely-dead-code"
+        - "07-stale-xamarin-references"
         - "08-string-literal-error-messages"
         required: false
         type: choice
@@ -63,6 +63,7 @@ safe-outputs:
     - src/**
     - tests/**
     - Documentation/**
+    - README.md
     auto-close-issue: false
     draft: false
     fallback-as-issue: false
@@ -205,14 +206,20 @@ Before changing files, score the proposed fix on a 0–30 scale across three dim
 
 **Threshold: ≥ 22 / 30 to implement.** Additionally, **safety must be ≥ 6** — any fix scoring lower on safety must be declined regardless of total. The SkiaSharp project that pioneered this rubric confirmed it correctly stops risky behavior-change fixes that otherwise look attractive.
 
+For `08-string-literal-error-messages`, a change that only moves an existing
+diagnostic into the English resource system, preserving its meaning, arguments,
+severity, and control flow, scores at least 8 for safety and 8 for scope. Treat
+the required resource, checked-in resource accessor, source call site, and XA
+message documentation as one cohesive fix.
+
 If the proposal scores below either bar, call `noop` with a message that includes the score breakdown and why you declined. Do not modify files.
 
 ## Phase 4: Implement and Validate
 
 Implement the fix yourself:
 
 1. Make the smallest complete change that resolves the verified problem.
-2. Follow all repository instructions and existing style. Never modify generated files, non-English localization files, or unrelated code.
+2. Follow all repository instructions and existing style. Never modify generated files, non-English localization files, or unrelated code. The only generated-file exception is a checked-in `Resources.Designer.cs` accessor required by `08-string-literal-error-messages`; change only the accessor for the new English resource.
 3. Add or update a focused test when behavior changes or a regression test is practical.
 4. Bootstrap the repository toolchain with `./build.sh Prepare` before validation. This installs the repository-pinned .NET 11 SDK under the active `bin/{Debug|Release}/dotnet` configuration and prepares generated build prerequisites. Then run the smallest targeted build or test command through `./dotnet-local.sh`; never use the runner's system `dotnet` or lower `DotNetTargetFrameworkVersion` to work around missing tooling. A PR requires successful validation; if the fix cannot be validated in this environment, revert only your own changes and call `noop`.
 5. Review `git diff` for accidental or unrelated edits.

.github/workflows/nightly-fix-finder/06-completely-dead-code.sh

@@ -0,0 +1,86 @@
+#!/usr/bin/env bash
+# Category: Completely Dead Code
+
+cat << 'GUIDANCE'
+## Category: Completely Dead Code
+
+### What to look for
+Code under `src/` that can be proven to have no callers and no execution path:
+- Private members or nested types whose identifier has no references
+- Branches that are unconditionally unreachable
+- Disabled `#if false` blocks with no documented reason to retain them
+
+The proof must account for every target framework and build configuration in
+the owning project. "Probably unused" is not sufficient.
+
+### How to fix
+Delete the smallest complete dead member or block, then remove imports or helper
+code that became unused as a direct result. Add or update a focused test only
+when removal changes a code path that can be exercised.
+
+Before deleting a private member, search the full repository for its identifier
+and inspect attributes, interfaces, partial declarations, build targets, and
+generated-code inputs that could reference it indirectly.
+
+### What NOT to flag
+- Public, protected, or internal API
+- JNI callbacks, `[Register]` members, Java peer members, or native entry points
+- MSBuild task types or properties, serialization members, reflection targets,
+  dependency-injection entry points, or members referenced by name
+- Platform-, runtime-, ABI-, or TFM-specific code that is live in another build
+- Compatibility code retained for older Android or .NET versions
+- Generated files, submodules under `external/`, or test code
+- Code that is merely redundant, inefficient, or currently untested
+GUIDANCE
+
+echo ""
+echo "## Scan Data"
+echo "### Explicitly unreachable or disabled constructs"
+OBVIOUS=$(grep -rnP '^\s*(#if\s+false\b|if\s*\(\s*false\s*\)|while\s*\(\s*false\s*\))' \
+    --include='*.cs' \
+    --exclude-dir=obj --exclude-dir=bin \
+    --exclude-dir=Tests --exclude-dir=Test --exclude-dir=tests \
+    --exclude='*.generated.cs' --exclude='*.Designer.cs' --exclude='*.g.cs' \
+    src/ 2>/dev/null \
+  | shuf -n 20)
+if [ -n "$OBVIOUS" ]; then
+    echo "$OBVIOUS"
+else
+    echo "None found"
+fi
+
+echo ""
+echo "### Private declarations whose identifier appears only once in repository C# source"
+SINGLETON_TOKENS=$(mktemp)
+PRIVATE_DECLARATIONS=$(mktemp)
+trap 'rm -f "$SINGLETON_TOKENS" "$PRIVATE_DECLARATIONS"' EXIT
+
+grep -rhoP '\b[A-Za-z_][A-Za-z0-9_]*\b' \
+    --include='*.cs' \
+    --exclude-dir=obj --exclude-dir=bin \
+    src/ 2>/dev/null \
+  | sort | uniq -c \
+  | awk '$1 == 1 { print $2 }' > "$SINGLETON_TOKENS"
+
+grep -rnPo '^\s*private\s+(?:(?:static|readonly|const|async|unsafe|partial|volatile|new|sealed)\s+)*(?:[A-Za-z_][A-Za-z0-9_.<>,?\[\]]*\s+)+\K[A-Za-z_][A-Za-z0-9_]*(?=\s*(?:\(|\{|=>|=|;))' \
+    --include='*.cs' \
+    --exclude-dir=obj --exclude-dir=bin \
+    --exclude-dir=Tests --exclude-dir=Test --exclude-dir=tests \
+    --exclude='*.generated.cs' --exclude='*.Designer.cs' --exclude='*.g.cs' \
+    src/ 2>/dev/null > "$PRIVATE_DECLARATIONS"
+
+CANDIDATES=$(awk -F: '
+    NR == FNR {
+        singleton [$1] = 1
+        next
+    }
+    length ($NF) >= 4 && singleton [$NF] {
+        print
+    }
+' "$SINGLETON_TOKENS" "$PRIVATE_DECLARATIONS" | shuf -n 20)
+
+if [ -n "$CANDIDATES" ]; then
+    echo "$CANDIDATES"
+else
+    echo "None found"
+fi