fix(honcho): read Honcho 3.0.x response schema — memory reads were silently empty

Against a self-hosted Honcho 3.0.11 every read path came back empty while
the server was healthy and full of derived facts: the plugin parsed a
`conclusions`/`summary` shape the API no longer emits.

- honcho-client: typed models for the real schema — `PeerContext`
  (`representation` markdown + `peer_card`), `SessionContext` (`summary` as
  an object, `peer_representation`), wrapped `PeerCard` (a bare array on PUT
  is a 422, which also broke `honcho_profile` writes).
- plugin: the turn-time injection and `honcho_context` read the
  representation; `honcho_search` and the page's /search now use
  `conclusions/query` (observer/observed scoping inside `filters`) — a real
  ranked semantic search with fact ids, which `peer_context?search_query`
  never provided; /overview returns card + representation + conclusions.
- compose: pin the Honcho image by digest (3.0.11) — ghcr publishes no v3
  semver tags, and an untracked `:latest` pull is what drifted the schema.
- tests: fixture tests from payloads captured on the live server, plus an
  env-gated live smoke test (HONCHO_E2E_URL/_WS/_PEER, `cargo test
  -p honcho-client -- --ignored`) — run it before any future Honcho bump.

honcho/docker-compose.yml

@@ -13,6 +13,11 @@
 #
 # The API will be available at http://localhost:8000
 # Interactive docs: http://localhost:8000/docs
+#
+# The Honcho image is PINNED BY DIGEST (ghcr publishes no v3 semver tags, only
+# `latest`): this digest is Honcho 3.0.11. The plugin parses a version-specific
+# API schema (`representation`/`peer_card`, wrapped card, `conclusions/query`
+# filters) — bump the digest deliberately and re-verify, never via `:latest`.
 
 services:
 
@@ -20,7 +25,7 @@ services:
   # Applies Alembic migrations before the API starts.
   # Exits with code 0 when done; Docker Compose marks it "completed".
   migrate:
-    image: ghcr.io/plastic-labs/honcho:latest
+    image: ghcr.io/plastic-labs/honcho@sha256:59f099ad85713105608c9b239a4f1386fbebd8647323d3a04646bb3c975d8c6b # Honcho 3.0.11, pinned — see header
     env_file: .env
     environment:
       DB_CONNECTION_URI: postgresql+psycopg://${POSTGRES_USER:-honcho}:${POSTGRES_PASSWORD:-honcho}@db:5432/${POSTGRES_DB:-honcho}
@@ -33,7 +38,7 @@ services:
 
   # ── API ────────────────────────────────────────────────────────────────────
   api:
-    image: ghcr.io/plastic-labs/honcho:latest
+    image: ghcr.io/plastic-labs/honcho@sha256:59f099ad85713105608c9b239a4f1386fbebd8647323d3a04646bb3c975d8c6b # Honcho 3.0.11, pinned — see header
     restart: unless-stopped
     ports:
       - "${HONCHO_PORT:-8000}:8000"
@@ -65,7 +70,7 @@ services:
   # Without a working LLM key this service will fail to process messages;
   # the API itself will still work but no long-term memory will be built.
   deriver:
-    image: ghcr.io/plastic-labs/honcho:latest
+    image: ghcr.io/plastic-labs/honcho@sha256:59f099ad85713105608c9b239a4f1386fbebd8647323d3a04646bb3c975d8c6b # Honcho 3.0.11, pinned — see header
     restart: unless-stopped
     command: ["/app/.venv/bin/python", "-m", "src.deriver"]
     env_file: .env