feat(hindsight): feature parity, setup wizard, and config improvements

Port missing features from the hindsight-hermes external integration
package into the native plugin. Only touches plugin files — no core
changes.

Features:
- Tags on retain/recall (tags, recall_tags, recall_tags_match)
- Recall config (recall_max_tokens, recall_max_input_chars, recall_types,
  recall_prompt_preamble)
- Retain controls (retain_every_n_turns, auto_retain, auto_recall,
  retain_async via aretain_batch, retain_context)
- Bank config via Banks API (bank_mission, bank_retain_mission)
- Structured JSON retain with per-message timestamps
- Full session accumulation with document_id for dedup
- Custom post_setup() wizard with curses picker
- Mode-aware dep install (hindsight-client for cloud, hindsight-all for local)
- local_external mode and openai_compatible LLM provider
- OpenRouter support with auto base URL
- Auto-upgrade of hindsight-client to >=0.4.22 on session start
- Comprehensive debug logging across all operations
- 46 unit tests
- Updated README and website docs

plugins/memory/hindsight/plugin.yaml

@@ -2,9 +2,7 @@ name: hindsight
 version: 1.0.0
 description: "Hindsight — long-term memory with knowledge graph, entity resolution, and multi-strategy retrieval."
 pip_dependencies:
-  - hindsight-client
-  - hindsight-all
-requires_env:
-  - HINDSIGHT_API_KEY
+  - "hindsight-client>=0.4.22"
+requires_env: []
 hooks:
   - on_session_end