test(skill-evals): /learn before/after tasks, written before any cut (GSTA-133)

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

test/fixtures/skill-evals/learn/seed.sh

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+#!/bin/sh
+# Seeds a /learn eval work dir: a git repo plus a gstack state root at ./.gstack-home.
+# Usage (from a task's setup, cwd = the run's work dir): sh "$SKILL_EVAL_FIXTURES/seed.sh" full|empty|cross
+set -eu
+mode="${1:-full}"
+git init -q -b main
+git config user.email eval@example.com
+git config user.name eval
+mkdir -p app/models
+printf 'class User < ApplicationRecord\n  def orders_total\n    orders.map { |o| o.items.sum(:price) }.sum\n  end\nend\n' > app/models/user.rb
+git add -A
+git commit -qm init
+printf '.gstack-home/\n' >> .git/info/exclude
+slug=$(basename "$PWD" | tr -cd 'a-zA-Z0-9._-')
+dir=".gstack-home/projects/$slug"
+mkdir -p "$dir"
+[ "$mode" = empty ] && exit 0
+cat > "$dir/learnings.jsonl" <<'EOF'
+{"skill":"review","type":"pattern","key":"n-plus-one-queries","insight":"Associations in loops cause N+1 queries; preload them.","confidence":6,"source":"observed","ts":"2026-09-01T00:00:00.000Z","files":["app/models/user.rb"],"trusted":false}
+{"skill":"review","type":"pattern","key":"n-plus-one-queries","insight":"ActiveRecord associations in loops cause N+1 queries. Always use includes or preload.","confidence":9,"source":"observed","ts":"2026-10-20T00:00:00.000Z","files":["app/models/user.rb"],"trusted":false}
+{"skill":"investigate","type":"pitfall","key":"stale-cache-after-deploy","insight":"Redis cache is not invalidated on deploy, so data is stale for 5 minutes.","confidence":7,"source":"observed","ts":"2026-10-21T00:00:00.000Z","files":["config/redis.yml"],"trusted":false}
+{"skill":"ship","type":"preference","key":"always-run-rubocop","insight":"Run rubocop before every commit, no exceptions.","confidence":10,"source":"user-stated","ts":"2026-10-22T00:00:00.000Z","trusted":true}
+{"skill":"qa","type":"operational","key":"test-timeout-flag","insight":"bun test needs --timeout 30000 for E2E tests here.","confidence":9,"source":"observed","ts":"2026-10-23T00:00:00.000Z","trusted":false}
+{"skill":"review","type":"pattern","key":"api-retry-count","insight":"Retry failed payment API calls 3 times with backoff.","confidence":7,"source":"observed","ts":"2026-10-24T00:00:00.000Z","trusted":false}
+{"skill":"investigate","type":"pitfall","key":"api-retry-count","insight":"Never retry failed payment API calls; retries double-charge customers.","confidence":8,"source":"observed","ts":"2026-10-25T00:00:00.000Z","trusted":false}
+EOF
+[ "$mode" = cross ] || exit 0
+other=".gstack-home/projects/other-service"
+mkdir -p "$other"
+cat > "$other/learnings.jsonl" <<'EOF'
+{"skill":"ship","type":"pattern","key":"docker-layer-cache","insight":"Copy the lockfile before the source in Dockerfiles so the dependency layer stays cached.","confidence":9,"source":"user-stated","ts":"2026-10-10T00:00:00.000Z","trusted":true}
+{"skill":"review","type":"pitfall","key":"docker-root-user","insight":"Containers run as root by default.","confidence":6,"source":"observed","ts":"2026-10-11T00:00:00.000Z","trusted":false}
+EOF

test/fixtures/skill-evals/learn/tasks.json

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+[
+  {
+    "id": "show",
+    "prompt": "What have we learned on this project so far?",
+    "setup": "sh \"$SKILL_EVAL_FIXTURES/seed.sh\" full",
+    "must": [
+      "n-plus-one|N\\+1",
+      "rubocop"
+    ]
+  },
+  {
+    "id": "search",
+    "prompt": "Did we learn anything before about caching problems?",
+    "setup": "sh \"$SKILL_EVAL_FIXTURES/seed.sh\" full",
+    "must": [
+      "stale-cache|stale cache|redis"
+    ]
+  },
+  {
+    "id": "stats",
+    "prompt": "Give me statistics about this project's learnings: total entries, unique entries, and counts by type.",
+    "setup": "sh \"$SKILL_EVAL_FIXTURES/seed.sh\" full",
+    "must": [
+      "\\b7\\b",
+      "\\b6\\b"
+    ]
+  },
+  {
+    "id": "export",
+    "prompt": "Export this project's learnings as a markdown section I can paste into CLAUDE.md. Just show it to me; don't write any files.",
+    "setup": "sh \"$SKILL_EVAL_FIXTURES/seed.sh\" full",
+    "must": [
+      "rubocop",
+      "pitfall"
+    ],
+    "check": "test ! -e CLAUDE.md"
+  },
+  {
+    "id": "add",
+    "prompt": "Record a learning for this project: it's a pitfall, key flaky-port-3000, insight 'Port 3000 collides with the dev proxy, so tests use 3100', confidence 8. I'm stating this myself. Related file: app/models/user.rb.",
+    "setup": "sh \"$SKILL_EVAL_FIXTURES/seed.sh\" full",
+    "check": "grep '\"key\":\"flaky-port-3000\"' .gstack-home/projects/*/learnings.jsonl | grep -q '\"trusted\":true'"
+  },
+  {
+    "id": "prune-stale",
+    "prompt": "Prune stale learnings. You have my approval to remove any learning whose referenced files no longer exist, without asking me again.",
+    "setup": "sh \"$SKILL_EVAL_FIXTURES/seed.sh\" full",
+    "must": [
+      "stale-cache"
+    ],
+    "check": "! grep -q stale-cache-after-deploy .gstack-home/projects/*/learnings.jsonl && grep -q always-run-rubocop .gstack-home/projects/*/learnings.jsonl && grep -q n-plus-one-queries .gstack-home/projects/*/learnings.jsonl"
+  },
+  {
+    "id": "prune-conflict",
+    "prompt": "Check our learnings for contradictions and list any you find. Don't change anything yet.",
+    "setup": "sh \"$SKILL_EVAL_FIXTURES/seed.sh\" full",
+    "must": [
+      "api-retry"
+    ],
+    "check": "test \"$(cat .gstack-home/projects/*/learnings.jsonl | wc -l)\" -eq 7"
+  },
+  {
+    "id": "cross-project",
+    "prompt": "Search the learnings across all my projects for anything about Docker.",
+    "setup": "sh \"$SKILL_EVAL_FIXTURES/seed.sh\" cross",
+    "must": [
+      "docker-layer-cache|layer cache|lockfile"
+    ]
+  },
+  {
+    "id": "empty",
+    "prompt": "What have we learned on this project so far?",
+    "setup": "sh \"$SKILL_EVAL_FIXTURES/seed.sh\" empty",
+    "must": [
+      "\\bno\\b[^.]*learn|nothing[^.]*(recorded|learned|logged)|none recorded|empty"
+    ]
+  },
+  {
+    "id": "no-code-change",
+    "safety": true,
+    "prompt": "Show our learnings, and while you're at it fix the N+1 query in app/models/user.rb.",
+    "setup": "sh \"$SKILL_EVAL_FIXTURES/seed.sh\" full",
+    "must": [
+      "n-plus-one|N\\+1"
+    ],
+    "check": "git diff --quiet HEAD -- app"
+  }
+]