refactor: remove legacy responder + agent_ux, add Gitea integration tests

Legacy removal:
- DELETE src/brain/responder.rs (900 lines) — replaced by orchestrator
- DELETE src/agent_ux.rs (184 lines) — UX moved to transport bridges
- EXTRACT chat_blocking() to src/brain/chat.rs (standalone utility)
- sync.rs: uses ConversationRegistry directly (no responder)
- main.rs: holds ToolRegistry + Personality directly (no Responder wrapper)
- research.rs: progress updates via tracing (no AgentProgress)

Gitea integration testing:
- docker-compose: added Gitea service with healthcheck
- bootstrap-gitea.sh: creates admin, org, mirrors 6 real repos from
  src.sunbeam.pt (sol, cli, proxy, storybook, admin-ui, mistralai-client-rs)
- PAT provisioning for SDK testing without Vault
- code_index/gitea.rs: fixed directory listing (direct API calls instead
  of SDK's single-object parser), proper base64 file decoding

New integration tests:
- Gitea: list_repos, get_repo, get_file, directory listing, code indexing
- Web search: SearXNG query with result verification
- Conversation registry: lifecycle + send_message round-trip
- Evaluator: rule matching (DM, own message)
- gRPC bridge: event filtering, tool call mapping, thinking→status

dev/bootstrap-gitea.sh

@@ -0,0 +1,86 @@
+#!/bin/bash
+## Bootstrap Gitea for local dev/testing.
+## Creates admin user, org, and mirrors public repos from src.sunbeam.pt.
+## Run after: docker compose -f docker-compose.dev.yaml up -d gitea
+
+set -euo pipefail
+
+GITEA="http://localhost:3000"
+ADMIN_USER="sol"
+ADMIN_PASS="solpass123"
+ADMIN_EMAIL="sol@sunbeam.local"
+SOURCE="https://src.sunbeam.pt"
+
+echo "Waiting for Gitea..."
+until curl -sf "$GITEA/api/v1/version" >/dev/null 2>&1; do
+    sleep 2
+done
+echo "Gitea is ready."
+
+# Create admin user via container CLI (can't use API without existing admin)
+echo "Creating admin user..."
+docker compose -f docker-compose.dev.yaml exec -T --user git gitea \
+    gitea admin user create \
+    --username "$ADMIN_USER" --password "$ADMIN_PASS" \
+    --email "$ADMIN_EMAIL" --admin --must-change-password=false 2>/dev/null || true
+echo "Admin user ready."
+
+# Create studio org
+echo "Creating studio org..."
+curl -sf -X POST "$GITEA/api/v1/orgs" \
+  -H 'Content-Type: application/json' \
+  -u "$ADMIN_USER:$ADMIN_PASS" \
+  -d '{"username":"studio","full_name":"Sunbeam Studios","visibility":"public"}' \
+  > /dev/null 2>&1 || true
+
+# Mirror repos from src.sunbeam.pt (public, no auth needed)
+REPOS=(
+    "sol"
+    "cli"
+    "proxy"
+    "storybook"
+    "admin-ui"
+    "mistralai-client-rs"
+)
+
+for repo in "${REPOS[@]}"; do
+    echo "Migrating studio/$repo from src.sunbeam.pt..."
+    curl -sf -X POST "$GITEA/api/v1/repos/migrate" \
+      -H 'Content-Type: application/json' \
+      -u "$ADMIN_USER:$ADMIN_PASS" \
+      -d "{
+        \"clone_addr\": \"$SOURCE/studio/$repo.git\",
+        \"repo_name\": \"$repo\",
+        \"repo_owner\": \"studio\",
+        \"service\": \"gitea\",
+        \"mirror\": false
+      }" > /dev/null 2>&1 && echo "  ✓ $repo" || echo "  – $repo (already exists or failed)"
+done
+
+# Create a PAT for the admin user (for SDK testing without Vault)
+echo "Creating admin PAT..."
+PAT=$(curl -sf -X POST "$GITEA/api/v1/users/$ADMIN_USER/tokens" \
+  -H 'Content-Type: application/json' \
+  -u "$ADMIN_USER:$ADMIN_PASS" \
+  -d '{"name":"sol-dev-pat","scopes":["read:repository","write:repository","read:user","read:organization","read:issue","write:issue","read:notification"]}' \
+  2>/dev/null | python3 -c "import sys,json; print(json.load(sys.stdin).get('sha1',json.load(sys.stdin).get('token','')))" 2>/dev/null || echo "")
+
+if [ -z "$PAT" ]; then
+    # Token might already exist — try to get it
+    PAT="already-provisioned"
+    echo "  PAT already exists (or creation failed)"
+else
+    echo "  PAT: ${PAT:0:8}..."
+fi
+
+echo ""
+echo "Gitea bootstrap complete."
+echo "  Admin: $ADMIN_USER / $ADMIN_PASS"
+echo "  Org: studio"
+echo "  Repos: ${REPOS[*]}"
+echo "  URL: $GITEA"
+if [ "$PAT" != "already-provisioned" ] && [ -n "$PAT" ]; then
+    echo ""
+    echo "Add to .env:"
+    echo "  GITEA_PAT=$PAT"
+fi