fix(browse): sanitize lone Unicode surrogates at commandResult chokepoint + /batch envelope (#1440)

Page captures with mixed-script Unicode round-trip cleanly to the Claude API.
Two new utilities in browse/src/sanitize.ts: stripLoneSurrogates for raw UTF-16
strings, stripLoneSurrogateEscapes for \uXXXX JSON escape text. sanitizeBody
picks the right pass based on cr.json.

buildCommandResponse is extracted from handleCommand (now exported) and
applies sanitization before new Response(). /batch was bypassing this
chokepoint via direct JSON.stringify, so it sanitizes each cr.result before
pushing AND wraps the envelope with stripLoneSurrogateEscapes. Defense in
depth wraps at getCleanText, getCleanTextWithStripping, html, accessibility,
and snapshot.ts return points so downstream consumers (datamarking, envelope
wrapping) see sanitized text before the response is built.

25 new unit tests across sanitize.test.ts and build-command-response.test.ts.
content-security.test.ts updated to accept either pre- or post-sanitize form
of the snapshot scoped branch (source-level regression check).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

autoplan/SKILL.md

@@ -1599,6 +1599,81 @@ noting which items are incomplete. Do not loop indefinitely.
 
 ## Phase 4: Final Approval Gate
 
+## Implementation Tasks aggregator
+
+Before rendering the Final Approval Gate output block below, aggregate the
+per-phase task lists each review skill wrote.
+
+```bash
+eval "$(~/.claude/skills/gstack/bin/gstack-slug 2>/dev/null)"
+TASKS_DIR="${HOME}/.gstack/projects/${SLUG:-unknown}"
+BRANCH=$(git branch --show-current 2>/dev/null || echo unknown)
+# Commit window: last 5 commits on this branch. Drops stale standalone reviews.
+COMMITS_RECENT=$(git log --format=%H -n 5 2>/dev/null | tr '\n' '|' | sed 's/|$//')
+
+AGGREGATED_TASKS=""
+if command -v jq >/dev/null 2>&1; then
+  # Collect entries from all 4 phases, scoped to current branch + commit window.
+  # For each phase, keep only the latest run_id. Within the surviving set,
+  # dedupe by (component, sorted(files), title) — exact match only.
+  # Sort by priority (P1 > P2 > P3) then by phase order.
+  ALL_JSONL=$(mktemp -t autoplan-tasks.XXXXXXXX)
+  for phase in ceo-review design-review eng-review devex-review; do
+    # Use find instead of glob expansion — zsh nomatch errors otherwise when
+    # a phase produced no JSONL files. Sorting by name keeps the order stable.
+    while IFS= read -r f; do
+      [ -f "$f" ] || continue
+      # Filter to current branch + recent commits, then keep records for the
+      # latest run_id only. (Single phase may have multiple files if the user
+      # re-ran the review; aggregator takes the newest.)
+      jq -c --arg branch "$BRANCH" --arg commits "$COMMITS_RECENT" \
+        'select(.branch == $branch and ($commits | split("|") | index(.commit) != null))' \
+        "$f" 2>/dev/null >> "$ALL_JSONL" || true
+    done < <(find "$TASKS_DIR" -maxdepth 1 -name "tasks-$phase-*.jsonl" 2>/dev/null | sort)
+    # Reduce to latest run_id per phase
+    if [ -s "$ALL_JSONL" ]; then
+      jq -sc --arg phase "$phase" \
+        '[.[] | select(.phase == $phase)] | (max_by(.run_id) // null) as $latest_run | if $latest_run then map(select(.run_id == $latest_run.run_id)) else [] end | .[]' \
+        "$ALL_JSONL" > "$ALL_JSONL.phase" 2>/dev/null || true
+      # Replace with reduced version for this phase, accumulating others
+      jq -c --arg phase "$phase" 'select(.phase != $phase)' "$ALL_JSONL" > "$ALL_JSONL.other" 2>/dev/null || true
+      cat "$ALL_JSONL.other" "$ALL_JSONL.phase" > "$ALL_JSONL"
+      rm -f "$ALL_JSONL.phase" "$ALL_JSONL.other"
+    fi
+  done
+
+  # Exact-match dedup by (component, sorted(files), title). Non-matches kept
+  # separately with a possible-duplicate marker injected by the renderer.
+  AGGREGATED_TASKS=$(jq -s \
+    'group_by([.component, (.files | sort), .title])
+     | map(
+         # Take the highest-priority entry per group; tie-break by phase order
+         sort_by({P1:0,P2:1,P3:2}[.priority] // 99, {"ceo-review":0,"design-review":1,"eng-review":2,"devex-review":3}[.phase] // 99) | .[0]
+       )
+     | sort_by({P1:0,P2:1,P3:2}[.priority] // 99, {"ceo-review":0,"design-review":1,"eng-review":2,"devex-review":3}[.phase] // 99)
+     | if length == 0 then "_No actionable tasks emitted from any phase._" else
+         map("- [ ] **\(.id) (\(.priority), human: \(.effort_human) / CC: \(.effort_cc)) — \(.component)** — \(.title)\n  - Surfaced by: \(.phase) — \(.source_finding)\n  - Files: \(.files | join(", "))") | join("\n")
+       end' "$ALL_JSONL" 2>/dev/null | sed 's/^"//;s/"$//;s/\\n/\n/g')
+  rm -f "$ALL_JSONL"
+else
+  AGGREGATED_TASKS="_jq not installed — install jq to aggregate per-phase task lists. Skipping._"
+fi
+```
+
+Inside the Final Approval Gate output template below, render the aggregated
+markdown in the `### Implementation Tasks (aggregated across phases)` section.
+Substitute the contents of `$AGGREGATED_TASKS` (the bash variable set above)
+before printing the message to the user. This is NOT a template placeholder
+— the agent does the substitution at runtime, not gen-skill-docs at build time.
+
+If `$AGGREGATED_TASKS` is empty (no JSONL files found — none of the review
+skills ran in this session), render:
+
+`_No per-phase task lists found in $TASKS_DIR for branch $BRANCH. Each review
+skill writes its own; if you ran one of them but no list appears here, check
+that jq is installed and the tasks-<phase>-*.jsonl files exist._`
+
+
 **STOP here and present the final state to the user.**
 
 Present as a message, then use AskUserQuestion:
@@ -1649,6 +1724,10 @@ I recommend [X] — [principle]. But [Y] is also viable:
 
 ### Deferred to TODOS.md
 [Items auto-deferred with reasons]
+
+### Implementation Tasks (aggregated across phases)
+[Substitute the contents of $AGGREGATED_TASKS computed above. If empty:
+"_No per-phase task lists found in $TASKS_DIR for branch $BRANCH._"]
 ```
 
 **Cognitive load management:**

autoplan/SKILL.md.tmpl

@@ -769,6 +769,8 @@ noting which items are incomplete. Do not loop indefinitely.
 
 ## Phase 4: Final Approval Gate
 
+{{TASKS_SECTION_AGGREGATE}}
+
 **STOP here and present the final state to the user.**
 
 Present as a message, then use AskUserQuestion:
@@ -819,6 +821,10 @@ I recommend [X] — [principle]. But [Y] is also viable:
 
 ### Deferred to TODOS.md
 [Items auto-deferred with reasons]
+
+### Implementation Tasks (aggregated across phases)
+[Substitute the contents of $AGGREGATED_TASKS computed above. If empty:
+"_No per-phase task lists found in $TASKS_DIR for branch $BRANCH._"]
 ```
 
 **Cognitive load management:**