Update cdk portal wallet

.backportrc.json

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+{
+  "repoOwner": "cashubtc",
+  "repoName": "cdk",
+  "targetBranchChoices": ["v0.10.x", "v0.11.x", "v0.12.x", "v0.13.x"],
+  "autoMerge": false,
+  "autoMergeMethod": "merge"
+}

.cargo-mutants.toml

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+# Cargo mutants configuration
+# See: https://mutants.rs/
+
+# Skip simple getters that are trivially correct and tested by integration tests
+# These mutations would be caught by integration tests like test_split_with_fee
+exclude_re = [
+    "cashu/src/amount.rs.*FeeAndAmounts::fee",
+    "cashu/src/amount.rs.*FeeAndAmounts::amounts",
+]

.cargo/mutants.toml

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+# Mutation Testing Configuration for CDK
+# Phase 1: Focus on cashu crate only
+
+# Start with cashu crate only - exclude other crates initially
+exclude_globs = [
+    "crates/cdk-*/**",  # Exclude other crates initially
+    "**/tests/**",      # Don't mutate test code
+    "**/benches/**",    # Don't mutate benchmarks
+]
+
+# Reasonable timeout to catch hangs (5 minutes minimum)
+minimum_test_timeout = 300
+
+# Skip specific mutations that cause infinite loops
+# These mutations create scenarios where loops never terminate or recursive functions never return.
+# Format: "file.rs:line.*pattern"
+exclude_re = [
+    # dhke.rs:61 - Mutating counter += to *= causes infinite loop (counter stays 0)
+    "crates/cashu/src/dhke.rs:61:.*replace \\+= with \\*=",
+
+    # amount.rs:108 - Mutating % to / in split causes infinite loop
+    "crates/cashu/src/amount.rs:108:.*replace % with /",
+
+    # amount.rs:100 - split() returning empty vec causes infinite loops
+    "crates/cashu/src/amount.rs:100:.*replace.*split.*with vec!\\[\\]",
+    "crates/cashu/src/amount.rs:100:.*replace.*split.*with vec!\\[Default",
+
+    # amount.rs:203 - checked_add returning Some(Default/0) causes infinite increment loops
+    "crates/cashu/src/amount.rs:203:.*replace.*checked_add.*with Some\\(Default",
+
+    # amount.rs:226 - try_sum returning Ok(Default/0) causes infinite loops
+    "crates/cashu/src/amount.rs:226:.*replace.*try_sum.*with Ok\\(Default",
+
+    # amount.rs:288 - From<u64> returning Default/0 causes infinite loops
+    "crates/cashu/src/amount.rs:288:.*replace.*from.*with Default",
+
+    # amount.rs:331 - Sub returning Default/0 causes infinite loops
+    "crates/cashu/src/amount.rs:331:.*replace.*sub.*with Default",
+
+    # Trivial getters - not worth testing
+    "FeeAndAmounts::fee",
+    "FeeAndAmounts::amounts",
+]

.github/ISSUE_TEMPLATE/mutation-testing.md

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+---
+name: Mutation Testing Improvement
+about: Track improvements to mutation test coverage
+title: '[Mutation] '
+labels: 'mutation-testing, enhancement'
+assignees: ''
+
+---
+
+## Mutation Details
+
+**File:** `crates/cashu/src/...`
+**Line:** 123
+**Mutation:** replace foo() with bar()
+
+**Current Status:** MISSED
+
+## Why This Matters
+
+<!-- Explain the security/correctness implications -->
+
+## Proposed Fix
+
+<!-- Describe the test(s) needed to catch this mutation -->
+
+### Test Strategy
+
+- [ ] Add negative test case
+- [ ] Add edge case test
+- [ ] Add integration test
+- [ ] Other: ___________
+
+### Expected Test
+
+```rust
+#[test]
+fn test_() {
+    // Test that ensures this mutation would be caught
+}
+```
+
+## Verification
+
+After implementing the fix:
+
+```bash
+# Run mutation test on specific file
+cargo mutants --file crates/cashu/src/...
+
+# Or run mutation test on the specific function
+cargo mutants --file crates/cashu/src/... --re "function_name"
+```
+
+Expected result: Mutation should be **CAUGHT** ✅
+
+## Related
+
+<!-- Link to any related issues or PRs -->

.github/scripts/generate-agenda.sh

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+#!/bin/bash
+set -e
+
+# Configuration
+REPO="${GITHUB_REPOSITORY:-cashubtc/cdk}"
+DAYS_BACK="${DAYS_BACK:-7}"
+MEETING_LINK="https://meet.fulmo.org/cdk-dev"
+OUTPUT_DIR="meetings"
+
+# Calculate date range (last 7 days)
+SINCE_DATE=$(date -d "$DAYS_BACK days ago" -u +"%Y-%m-%dT%H:%M:%SZ")
+MEETING_DATE=$(date -u +"%b %d %Y 15:00 UTC")
+FILE_DATE=$(date -u +"%Y-%m-%d")
+
+echo "Generating meeting agenda for $MEETING_DATE"
+echo "Fetching data since $SINCE_DATE"
+
+# Function to format PR/issue list
+format_list() {
+    local items="$1"
+    if [ -z "$items" ]; then
+        echo "- None"
+    else
+        echo "$items" | while IFS=$'\t' read -r number title url; do
+            echo "- [#$number]($url) - $title"
+        done
+    fi
+}
+
+# Fetch merged PRs
+echo "Fetching merged PRs..."
+MERGED_PRS=$(gh pr list \
+    --repo "$REPO" \
+    --state merged \
+    --search "merged:>=$SINCE_DATE" \
+    --json number,title,url \
+    --jq '.[] | [.number, .title, .url] | @tsv' \
+    2>/dev/null || echo "")
+
+# Fetch recently active PRs (updated in last week, but not newly created)
+echo "Fetching recently active PRs..."
+RECENTLY_ACTIVE_PRS=$(gh pr list \
+    --repo "$REPO" \
+    --state open \
+    --search "updated:>=$SINCE_DATE -created:>=$SINCE_DATE" \
+    --json number,title,url \
+    --jq '.[] | [.number, .title, .url] | @tsv' \
+    2>/dev/null || echo "")
+
+# Fetch new PRs (opened in the last week)
+echo "Fetching new PRs..."
+NEW_PRS=$(gh pr list \
+    --repo "$REPO" \
+    --state open \
+    --search "created:>=$SINCE_DATE" \
+    --json number,title,url \
+    --jq '.[] | [.number, .title, .url] | @tsv' \
+    2>/dev/null || echo "")
+
+# Fetch new issues
+echo "Fetching new issues..."
+NEW_ISSUES=$(gh issue list \
+    --repo "$REPO" \
+    --state open \
+    --search "created:>=$SINCE_DATE" \
+    --json number,title,url \
+    --jq '.[] | [.number, .title, .url] | @tsv' \
+    2>/dev/null || echo "")
+
+# Fetch discussion items (labeled with meeting-discussion)
+echo "Fetching discussion items..."
+DISCUSSION_PRS=$(gh pr list \
+    --repo "$REPO" \
+    --state open \
+    --label "meeting-discussion" \
+    --json number,title,url \
+    --jq '.[] | [.number, .title, .url] | @tsv' \
+    2>/dev/null || echo "")
+
+DISCUSSION_ISSUES=$(gh issue list \
+    --repo "$REPO" \
+    --state open \
+    --label "meeting-discussion" \
+    --json number,title,url \
+    --jq '.[] | [.number, .title, .url] | @tsv' \
+    2>/dev/null || echo "")
+
+# Combine discussion items (PRs and issues)
+DISCUSSION_ITEMS=$(printf "%s\n%s" "$DISCUSSION_PRS" "$DISCUSSION_ISSUES" | grep -v '^$' || echo "")
+
+# Generate markdown
+AGENDA=$(cat <<EOF
+# CDK Development Meeting
+
+$MEETING_DATE
+
+Meeting Link: $MEETING_LINK
+
+## Merged
+
+$(format_list "$MERGED_PRS")
+
+## New
+
+### Issues
+
+$(format_list "$NEW_ISSUES")
+
+### PRs
+
+$(format_list "$NEW_PRS")
+
+## Recently Active
+
+$(format_list "$RECENTLY_ACTIVE_PRS")
+
+## Discussion
+
+$(format_list "$DISCUSSION_ITEMS")
+EOF
+)
+
+echo "$AGENDA"
+
+# Output to file if requested
+if [ "${OUTPUT_TO_FILE:-true}" = "true" ]; then
+    mkdir -p "$OUTPUT_DIR"
+    OUTPUT_FILE="$OUTPUT_DIR/$FILE_DATE-agenda.md"
+    echo "$AGENDA" > "$OUTPUT_FILE"
+    echo "Agenda saved to $OUTPUT_FILE"
+fi
+
+# Create GitHub Discussion if requested
+if [ "${CREATE_DISCUSSION:-false}" = "true" ]; then
+    echo "Creating GitHub discussion..."
+    DISCUSSION_TITLE="CDK Dev Meeting - $MEETING_DATE"
+
+    # Note: gh CLI doesn't have direct discussion creation yet, so we'd need to use the API
+    # For now, we'll just output instructions
+    echo "To create discussion manually, use the GitHub web interface or API"
+    echo "Title: $DISCUSSION_TITLE"
+fi
+
+# Output for GitHub Actions
+if [ -n "$GITHUB_OUTPUT" ]; then
+    echo "agenda_file=$OUTPUT_FILE" >> "$GITHUB_OUTPUT"
+    echo "meeting_date=$MEETING_DATE" >> "$GITHUB_OUTPUT"
+fi

.github/templates/failed-backport-issue.md

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+---
+title: Backport PR `#{{ env.PR_NUMBER }}` {{ env.SHORT_PR_TITLE }}
+labels: backport
+---
+PR: #{{ env.PR_NUMBER }}
+Title: {{ env.PR_TITLE }}
+
+The backport bot failed. Please open a PR to backport these changes.

.github/workflows/autoclose.yml

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+name: Close inactive issues and PRs
+on:
+  schedule:
+    - cron: "30 1 * * *"
+
+jobs:
+  close-issues:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/stale@v10
+        with:
+          days-before-issue-stale: 60
+          days-before-issue-close: 21
+          stale-issue-label: "stale"
+          stale-issue-message: "This issue is stale because it has been open for 60 days with no activity."
+          close-issue-message: "This issue was closed because it has been inactive for 21 days since being marked as stale."
+          days-before-pr-stale: 60
+          days-before-pr-close: 21
+          stale-pr-label: "stale"
+          stale-pr-message: "This PR is stale because it has been open for 60 days with no activity."
+          close-pr-message: "This PR was closed because it has been inactive for 21 days since being marked as stale."
+          exempt-issue-labels: "keep-open"
+          exempt-pr-labels: "keep-open"
+          repo-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/backport.yml

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+name: Backport merged pull request
+on:
+  pull_request_target:
+    # Run on merge (close) or if label is added after merging
+    types: [closed, labeled]
+
+# Set concurrency limit to a single backport workflow per PR
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  backport:
+    permissions:
+      contents: write # so it can comment
+      pull-requests: write # so it can create pull requests
+    name: Backport pull request
+    runs-on: ubuntu-latest
+
+    # Don't run on closed unmerged pull requests or if a non-backport label is added
+    if: |
+      github.event.pull_request.merged &&
+      (
+        github.event.action != 'labeled' ||
+        contains(github.event.label.name, 'backport')
+      )
+
+    outputs:
+      was_successful: ${{ steps.create-pr.outputs.was_successful }}
+
+    steps:
+      - uses: actions/checkout@v4
+      - id: create-pr
+        name: Create backport pull requests
+        uses: korthout/backport-action@v3
+        with:
+          github_token: ${{ secrets.BACKPORT_TOKEN }}
+
+  open-issue:
+    permissions:
+      contents: read
+      issues: write
+    name: Open issue for failed backports
+    runs-on: ubuntu-latest
+    needs: backport
+
+    # Open an issue only if the backport job failed
+    if: ${{ needs.backport.outputs.was_successful == 'false' }}
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set SHORT_PR_TITLE env
+        run: |
+          SHORT_PR_TITLE=$(
+            echo '${{ github.event.pull_request.title }}' \
+            | awk '{print (length($0) > 40) ? substr($0, 1, 40) "..." : $0}'
+          )
+          echo "SHORT_PR_TITLE=$SHORT_PR_TITLE" >> "$GITHUB_ENV"
+
+      - name: Create issue
+        uses: JasonEtco/create-an-issue@v2
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_NUMBER: ${{ github.event.number }}
+          PR_TITLE: ${{ github.event.pull_request.title }}
+          SHORT_PR_TITLE: ${{ env.SHORT_PR_TITLE }}
+        with:
+          filename: .github/templates/failed-backport-issue.md