Merge origin/main, resolve CHANGELOG conflict, bump to v0.13.7.0

Main landed v0.13.6.0 (GStack Learns) while this branch had v0.13.6.0
(Community Wave). Resolved by keeping both entries and bumping this
branch to v0.13.7.0. Regenerated SKILL.md files to pick up new learn
skill and apply the find -exec rm fix from this branch.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

bin/gstack-learnings-log

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+# gstack-learnings-log — append a learning to the project learnings file
+# Usage: gstack-learnings-log '{"skill":"review","type":"pitfall","key":"n-plus-one","insight":"...","confidence":8,"source":"observed"}'
+#
+# Append-only storage. Duplicates (same key+type) are resolved at read time
+# by gstack-learnings-search ("latest winner" per key+type).
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+eval "$("$SCRIPT_DIR/gstack-slug" 2>/dev/null)"
+GSTACK_HOME="${GSTACK_HOME:-$HOME/.gstack}"
+mkdir -p "$GSTACK_HOME/projects/$SLUG"
+
+INPUT="$1"
+
+# Validate: input must be parseable JSON
+if ! printf '%s' "$INPUT" | bun -e "JSON.parse(await Bun.stdin.text())" 2>/dev/null; then
+  echo "gstack-learnings-log: invalid JSON, skipping" >&2
+  exit 1
+fi
+
+# Inject timestamp if not present
+if ! printf '%s' "$INPUT" | bun -e "const j=JSON.parse(await Bun.stdin.text()); if(!j.ts) process.exit(1)" 2>/dev/null; then
+  INPUT=$(printf '%s' "$INPUT" | bun -e "
+    const j = JSON.parse(await Bun.stdin.text());
+    j.ts = new Date().toISOString();
+    console.log(JSON.stringify(j));
+  " 2>/dev/null) || true
+fi
+
+echo "$INPUT" >> "$GSTACK_HOME/projects/$SLUG/learnings.jsonl"

bin/gstack-learnings-search

@@ -0,0 +1,131 @@
+#!/usr/bin/env bash
+# gstack-learnings-search — read and filter project learnings
+# Usage: gstack-learnings-search [--type TYPE] [--query KEYWORD] [--limit N] [--cross-project]
+#
+# Reads ~/.gstack/projects/$SLUG/learnings.jsonl, applies confidence decay,
+# resolves duplicates (latest winner per key+type), and outputs formatted text.
+# Exit 0 silently if no learnings file exists.
+set -euo pipefail
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+eval "$("$SCRIPT_DIR/gstack-slug" 2>/dev/null)"
+GSTACK_HOME="${GSTACK_HOME:-$HOME/.gstack}"
+
+TYPE=""
+QUERY=""
+LIMIT=10
+CROSS_PROJECT=false
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --type) TYPE="$2"; shift 2 ;;
+    --query) QUERY="$2"; shift 2 ;;
+    --limit) LIMIT="$2"; shift 2 ;;
+    --cross-project) CROSS_PROJECT=true; shift ;;
+    *) shift ;;
+  esac
+done
+
+LEARNINGS_FILE="$GSTACK_HOME/projects/$SLUG/learnings.jsonl"
+
+# Collect all JSONL files to search
+FILES=()
+[ -f "$LEARNINGS_FILE" ] && FILES+=("$LEARNINGS_FILE")
+
+if [ "$CROSS_PROJECT" = true ]; then
+  # Add other projects' learnings (max 5, sorted by mtime)
+  for f in $(find "$GSTACK_HOME/projects" -name "learnings.jsonl" -not -path "*/$SLUG/*" 2>/dev/null | head -5); do
+    FILES+=("$f")
+  done
+fi
+
+if [ ${#FILES[@]} -eq 0 ]; then
+  exit 0
+fi
+
+# Process all files through bun for JSON parsing, decay, dedup, filtering
+cat "${FILES[@]}" 2>/dev/null | bun -e "
+const lines = (await Bun.stdin.text()).trim().split('\n').filter(Boolean);
+const now = Date.now();
+const type = '${TYPE}';
+const query = '${QUERY}'.toLowerCase();
+const limit = ${LIMIT};
+const slug = '${SLUG}';
+
+const entries = [];
+for (const line of lines) {
+  try {
+    const e = JSON.parse(line);
+    if (!e.key || !e.type) continue;
+
+    // Apply confidence decay: observed/inferred lose 1pt per 30 days
+    let conf = e.confidence || 5;
+    if (e.source === 'observed' || e.source === 'inferred') {
+      const days = Math.floor((now - new Date(e.ts).getTime()) / 86400000);
+      conf = Math.max(0, conf - Math.floor(days / 30));
+    }
+    e._effectiveConfidence = conf;
+
+    // Determine if this is from the current project or cross-project
+    // Cross-project entries are tagged for display
+    e._crossProject = !line.includes(slug) && '${CROSS_PROJECT}' === 'true';
+
+    entries.push(e);
+  } catch {}
+}
+
+// Dedup: latest winner per key+type
+const seen = new Map();
+for (const e of entries) {
+  const dk = e.key + '|' + e.type;
+  const existing = seen.get(dk);
+  if (!existing || new Date(e.ts) > new Date(existing.ts)) {
+    seen.set(dk, e);
+  }
+}
+let results = Array.from(seen.values());
+
+// Filter by type
+if (type) results = results.filter(e => e.type === type);
+
+// Filter by query
+if (query) results = results.filter(e =>
+  (e.key || '').toLowerCase().includes(query) ||
+  (e.insight || '').toLowerCase().includes(query) ||
+  (e.files || []).some(f => f.toLowerCase().includes(query))
+);
+
+// Sort by effective confidence desc, then recency
+results.sort((a, b) => {
+  if (b._effectiveConfidence !== a._effectiveConfidence) return b._effectiveConfidence - a._effectiveConfidence;
+  return new Date(b.ts).getTime() - new Date(a.ts).getTime();
+});
+
+// Limit
+results = results.slice(0, limit);
+
+if (results.length === 0) process.exit(0);
+
+// Format output
+const byType = {};
+for (const e of results) {
+  const t = e.type || 'unknown';
+  if (!byType[t]) byType[t] = [];
+  byType[t].push(e);
+}
+
+// Summary line
+const counts = Object.entries(byType).map(([t, arr]) => arr.length + ' ' + t + (arr.length > 1 ? 's' : ''));
+console.log('LEARNINGS: ' + results.length + ' loaded (' + counts.join(', ') + ')');
+console.log('');
+
+for (const [t, arr] of Object.entries(byType)) {
+  console.log('## ' + t.charAt(0).toUpperCase() + t.slice(1) + 's');
+  for (const e of arr) {
+    const cross = e._crossProject ? ' [cross-project]' : '';
+    const files = e.files?.length ? ' (files: ' + e.files.join(', ') + ')' : '';
+    console.log('- [' + e.key + '] (confidence: ' + e._effectiveConfidence + '/10, ' + e.source + ', ' + (e.ts || '').split('T')[0] + ')' + cross);
+    console.log('  ' + e.insight + files);
+  }
+  console.log('');
+}
+" 2>/dev/null || exit 0