fix(agent-chat): streaming state leak, document parser magic bytes, HITL flow

### Bugfixes — Agent Chat 'Думаю' State Leak
- fix(agent-chat): loadHistory() now resets streamingState/idle + cancels stale
  submission — prevents 'Думаю' state leak across conversation switches
- fix(agent-chat): onDisconnected/onDisconnectedPermanent cascade to
  streamingState — prevents permanent hang on connection loss during stream
- fix(agent-chat):  guard on isLoadingHistory — prevents false commit
  of 'agent unavailable' fallback when switching conversations
- fix(agent-chat): remove race in _sendNow empty-response check vs Svelte
   microtask (duplicate logic removed,  handles correctly)
- fix(stream-processor): confirm_resolved now appends msg.text to partialText
  instead of dropping it

### Bugfixes — Backend PDF Upload
- fix(document-parser): _detect_format_by_magic() — reads file header magic
  bytes as fallback when Gradio loses filename
- fix(document-parser): improved name extraction — tries orig_name, path stem
- fix(document-parser): @RELATION AgentChatTypes -> AgentChat.Types

### HITL Flow & Agent Chat Improvements
- feat(agent): HITL resume confirm/deny with userId/userJwt/envId propagation
- feat(agent): confirm_required metadata fallback via aget_state() after
  'Event loop is closed' error during interrupt
- feat(agent): interrupt_before re-enabled via AGENT_CONFIRM_TOOLS env var
- feat(frontend): debug panel with connection/stream state monitoring
- feat(frontend): AgentChatModel constructor options + onBeforeSend callback
- feat(frontend): crypto.randomUUID() for local conversation ID on first send

### Backend Agent Refactoring
- refactor(agent): langgraph_setup — monkey-patch for PydanticSerializationError
- refactor(agent): tools.py — dual identity headers, expanded tool set
- refactor(agent): run.py — _find_free_port, Gradio server port fallback
- refactor(agent): app.py — file size validation, message truncation, HITL path

### Frontend
- feat(dashboard-hub): DashboardHubModel with filters, pagination, git actions
- feat(ui): DateRangeFilter component
- feat(i18n): new dashboard keys; cache tooltips fix
- fix(i18n): full run tooltips — cache is NOT ignored

### Semantic Protocol
- chore(agents): update all agents with canonical format
- chore(skills): sync semantics-core, semantics-contracts, molecular-cot-logging

### Housekeeping
- chore: remove stale semantic reports (10 files, Jan 2026)
- chore: update 033-gradio-agent-chat specs, contracts, UX, tasks, tests
- chore: add .agents/ directory (mirrors .opencode/ agent layouts)
- chore: update run.sh with DEV_MODE, port management

.opencode/agents/fullstack-coder.md

@@ -49,12 +49,13 @@ Load and follow these skills (MANDATORY):
 - Use browser-driven validation for frontend changes AND pytest for backend verification.
 
 ## Axiom MCP Tools
-See `semantics-core` §VI for the canonical tool reference. For fullstack work, key tools:
-- `axiom_semantic_discovery search_contracts` + `local_context` — contract lookup across both stacks
-- `axiom_semantic_discovery read_outline` — verify anchors before/after editing on both stacks
-- `axiom_contract_metadata update_metadata` / `axiom_contract_patch` — safe mutation (checkpoints)
-- `axiom_semantic_validation impact_analysis` — cross-stack dependency graph
-- `axiom_semantic_index rebuild rebuild_mode="full"` — reindex after feature completion
+See `semantics-core` §VI for the canonical tool reference. Axiom MCP exposes 2 read-only tools (`search` and `audit`). For fullstack work:
+
+- `search` tool: `search_contracts` / `read_outline` / `local_context` / `workspace_health` / `rebuild`
+- `audit` tool: `impact_analysis` / `audit_contracts`
+
+**Mutation (metadata, anchors, relations) uses `edit`** — Axiom MCP has NO mutation tools.
+After cross-stack feature completion: `rebuild` via search tool.
 
 ## Fullstack Scope
 You own:
@@ -179,12 +180,12 @@ request:
 
 ## Semantic Safety
 Follow the canonical anti-corruption protocol in `semantics-contracts` §VIII. Key rules for fullstack:
-- Before editing ANY file (backend or frontend): `axiom_semantic_discovery read_outline`
+- Before editing ANY file (backend or frontend): `search` tool with `operation="read_outline"`
 - Never: insert code between anchor and first metadata; remove/move/duplicate `#endregion`; add `@COMPLEXITY N` or `@C N`
 - After editing: verify `read_outline` on both stacks — all pairs must match
-- Corrupted → rollback immediately
+- Corrupted → rollback via `git checkout` immediately
 - ONE file at a time across both stacks; verify between files
-- After cross-stack feature completion: `axiom_semantic_index rebuild rebuild_mode="full"`
+- After cross-stack feature completion: `search` tool with `operation="rebuild" rebuild_mode="full"`
 
 ## Recursive Delegation
 - For large features, you MAY spawn `python-coder` for backend-only subtasks or `svelte-coder` for frontend-only subtasks.