os-context extract: read_write_profile denominator for read-write sub-tag

Total main-loop Read/Write/Edit calls regardless of adjacency, split into
in-flagged-runs vs scattered (with line/target per scattered call), so the
rubric's missed-delegation/read-write sub-tag has a deterministic
denominator the consecutive-run scan cannot provide. Drops the stale
"sequential-dependent work is a valid reason" trailer superseded by
ADR-0043.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

plugins/os-context/audit/bin/extract

@@ -14,6 +14,7 @@ require "optparse"
 module OrchAudit
   READ_TOOLS = %w[Read Grep Glob Bash].freeze
   RUN_TOOLS = %w[Read Grep Glob Edit Write].freeze
+  RW_TOOLS = %w[Read Write Edit].freeze
 
   class Line
     attr_reader :number, :raw
@@ -139,19 +140,23 @@ module OrchAudit
       @threshold = threshold
     end
 
-    def candidates
-      runs = []
-      current = []
-      @calls.each do |call|
-        if extend_run?(current, call)
-          current << call
-        else
-          runs << current if qualifying?(current)
-          current = RUN_TOOLS.include?(call.name) ? [call] : []
+    def candidates = runs.map { |r| describe(r) }
+
+    def runs
+      @runs ||= begin
+        found = []
+        current = []
+        @calls.each do |call|
+          if extend_run?(current, call)
+            current << call
+          else
+            found << current if qualifying?(current)
+            current = RUN_TOOLS.include?(call.name) ? [call] : []
+          end
         end
+        found << current if qualifying?(current)
+        found
       end
-      runs << current if qualifying?(current)
-      runs.map { |r| describe(r) }
     end
 
     private
@@ -220,7 +225,16 @@ module OrchAudit
           m[:targets_sample].each { |t| md << "  - `#{t}`\n" }
         end
       end
-      md << "\nHeuristic candidates require auditor judgment; sequential-dependent work is a valid reason not to delegate.\n"
+      rw = d[:read_write_profile]
+      md << "\n## Main-loop Read/Write/Edit profile (missed-delegation/read-write denominator)\n\n"
+      counts = rw[:tool_counts].map { |k, v| "#{k}:#{v}" }.join(" ")
+      md << "- Total: #{rw[:total]} (#{counts}); in flagged runs: #{rw[:in_flagged_runs]}; scattered: #{rw[:scattered].size}\n"
+      rw[:scattered].each do |c|
+        md << "  - #{c[:tool]} line #{c[:line]} `#{c[:target]}`\n"
+      end
+      md << "\nHeuristic candidates and scattered calls require auditor judgment via the rubric's " \
+            "exemption decision procedure (E-a..E-d); under ADR-0043 there are no validity defenses " \
+            "for direct grunt work, only severity modifiers.\n"
       md
     end
 
@@ -235,12 +249,31 @@ module OrchAudit
       attach_rounds(main, agent_spawns)
 
       orchestrator_calls = calls.values.reject { |c| c.name == "Agent" }
+      scan = MissedDelegationScan.new(orchestrator_calls, @run_threshold)
       {
         metadata: metadata(main, agent_spawns),
         agent_spawns: agent_spawns.map(&:to_h),
         segments: segments(main).map(&:to_h),
-        missed_delegation_candidates:
-          MissedDelegationScan.new(orchestrator_calls, @run_threshold).candidates
+        missed_delegation_candidates: scan.candidates,
+        read_write_profile: read_write_profile(orchestrator_calls, scan)
+      }
+    end
+
+    # Denominator for the rubric's missed-delegation/read-write sub-tag: total
+    # main-loop Read/Write/Edit calls regardless of adjacency. The run scan only
+    # sees consecutive same-tool runs; "scattered" lists the calls it can't
+    # flag, for per-call exemption judgment by the auditor.
+    def read_write_profile(orchestrator_calls, scan)
+      rw = orchestrator_calls.select { |c| RW_TOOLS.include?(c.name) }
+      in_run = scan.runs.flatten.select { |c| RW_TOOLS.include?(c.name) }
+      scattered = rw - in_run
+      {
+        total: rw.size,
+        tool_counts: rw.map(&:name).tally,
+        in_flagged_runs: in_run.size,
+        scattered: scattered.map do |c|
+          { tool: c.name, line: c.line.number, target: c.target.to_s[0, 120] }
+        end
       }
     end