docs(state): clean up HANDOFF.json and mark all v1.0 phases complete

All 7 phases + sub-phases 6.1, 6.2, 7.1 complete as of 2026-06-05.
HANDOFF.json removed — no active handoff; STATE.md updated to reflect
v1.0 milestone done and next-action as "ready for next milestone."

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.planning/HANDOFF.json

@@ -1,36 +0,0 @@
-{
-  "version": "1.0",
-  "timestamp": "2026-06-03T16:33:39Z",
-  "phase": "7",
-  "phase_name": "Redo and Optimize LLM Integration",
-  "phase_dir": ".planning/phases/07-redo-and-optimize-llm-integration",
-  "plan": 0,
-  "task": 0,
-  "total_tasks": 15,
-  "status": "paused",
-  "completed_tasks": [],
-  "remaining_tasks": [
-    {"id": "07-01", "name": "Foundation: migration 0005 + SystemSettings ORM + ai_config.py HKDF + Wave 0 stubs", "status": "not_started"},
-    {"id": "07-02", "name": "ProviderConfig + GenericOpenAIProvider + OpenAI singleton + registry get_provider + MAX_AI_CHARS removal", "status": "not_started"},
-    {"id": "07-03", "name": "Anthropic output_config + AnthropicProvider singleton + classifier wiring via load_provider_config", "status": "not_started"},
-    {"id": "07-04", "name": "Celery retry 30/90/270s + _ClassificationError + re-classify endpoint re-queues", "status": "not_started"},
-    {"id": "07-05", "name": "Admin AI Providers panel + DocumentCard badge + Re-analyze button + human UAT checkpoint", "status": "not_started"}
-  ],
-  "blockers": [],
-  "human_actions_pending": [
-    {
-      "action": "UAT checkpoint in Plan 07-05 Task 4: manually test admin AI Providers panel and DocumentCard badge end-to-end",
-      "context": "Plan 05 is autonomous=false with a blocking human checkpoint — executor will pause and request manual verification",
-      "blocking": false
-    }
-  ],
-  "decisions": [
-    {"decision": "D-03: Anthropic uses output_config.format.type='json_schema' (not tool_use)", "rationale": "Constrained decoding, no beta headers needed, SDK >=0.95.0", "phase": "7"},
-    {"decision": "D-07: Client lifecycle = instance-level singleton self._client in __init__", "rationale": "AsyncOpenAI/AsyncAnthropic manage httpx connection pool; recreating per call destroys pool reuse", "phase": "7"},
-    {"decision": "D-14: extra_hosts already present in docker-compose.yml — no changes needed", "rationale": "RESEARCH.md confirmed both backend and celery-worker already have host.docker.internal:host-gateway", "phase": "7"},
-    {"decision": "D-02/Gemini: supports_json_mode=False, falls back to parse_classification()", "rationale": "Gemini OpenAI-compat does not support json_object string mode", "phase": "7"}
-  ],
-  "uncommitted_files": [],
-  "next_action": "Run /gsd:execute-phase 7 after /clear — start with plan 07-01",
-  "context_notes": "Phase 7 planning 100% complete. All 5 plans created and verified (commit 3df6250). anthropic pin must be bumped to >=0.95.0 in Plan 02. POST /api/documents/{id}/classify already exists — Plan 04 changes behavior only. AdminAiConfigTab.vue per-user table must be preserved; Plan 05 adds global section ABOVE it."
-}