feat(agents): add 7 specialist agents with tools and system prompts

Agents (all following 6-step contract: _plan/_gather/_reason/_act/_report):
- AccountingAgent: trial balance, chart of accounts, tax summary (HIPAA-locked)
- CrmAgent: pipeline summary, lead/opportunity management, won/lost analysis
- SalesAgent: sales orders, quotations, revenue by rep, expired quote detection
- ProjectAgent: task tracking, blocked/overdue detection, timesheet logging
- ElearningAgent: course completion, low-engagement flagging, next-course suggestion
- ExpensesAgent: expense sheets, pending approvals, policy violations (HIPAA-locked)
- EmployeesAgent: headcount, contracts, leaves, attendance, expired contract sweep (HIPAA-locked)

Tools (one file per domain):
- accounting_tools.py, crm_tools.py, sales_tools.py, project_tools.py
- elearning_tools.py, expenses_tools.py, employees_tools.py

System prompts: each agent has a domain-specific system.txt with rules and output format

All agents implement handle_peer_request() and sweep() for proactive monitoring
HIPAA-locked agents (accounting, expenses, employees) enforced via LLMRouter

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

agent_service/tools/expenses_tools.py

@@ -0,0 +1,86 @@
+from __future__ import annotations
+import logging
+from ..tools.odoo_client import OdooClient
+
+logger = logging.getLogger(__name__)
+
+
+class ExpensesTools:
+    def __init__(self, odoo: OdooClient):
+        self._o = odoo
+
+    async def get_expenses(self, employee_id: int = None, state: str = None,
+                            date_from: str = None, date_to: str = None, limit: int = 50) -> list:
+        domain = []
+        if employee_id:
+            domain.append(('employee_id', '=', employee_id))
+        if state:
+            domain.append(('state', '=', state))
+        if date_from:
+            domain.append(('date', '>=', date_from))
+        if date_to:
+            domain.append(('date', '<=', date_to))
+        fields = ['name', 'employee_id', 'product_id', 'total_amount', 'date',
+                  'state', 'sheet_id', 'description']
+        return await self._o.search_read('hr.expense', domain, fields, limit=limit)
+
+    async def get_expense_sheets(self, state: str = None, employee_id: int = None,
+                                  limit: int = 50) -> list:
+        domain = []
+        if state:
+            domain.append(('state', '=', state))
+        if employee_id:
+            domain.append(('employee_id', '=', employee_id))
+        fields = ['name', 'employee_id', 'state', 'total_amount', 'date',
+                  'accounting_date', 'journal_id']
+        return await self._o.search_read('hr.expense.sheet', domain, fields, limit=limit)
+
+    async def get_pending_approvals(self) -> list:
+        return await self._o.search_read(
+            'hr.expense.sheet',
+            [('state', '=', 'submit')],
+            ['name', 'employee_id', 'total_amount', 'date'],
+            limit=100,
+        )
+
+    async def approve_expense_sheet(self, sheet_id: int) -> bool:
+        try:
+            await self._o.call('hr.expense.sheet', 'approve_expense_sheets', [[sheet_id]])
+            logger.info('Approved expense sheet %s', sheet_id)
+            return True
+        except Exception as exc:
+            logger.warning('approve_expense_sheet failed %s: %s', sheet_id, exc)
+            return False
+
+    async def get_expenses_summary(self, date_from: str = None, date_to: str = None) -> dict:
+        domain = [('state', 'not in', ['refused'])]
+        if date_from:
+            domain.append(('date', '>=', date_from))
+        if date_to:
+            domain.append(('date', '<=', date_to))
+        expenses = await self._o.search_read('hr.expense', domain, ['total_amount', 'employee_id', 'product_id'], limit=1000)
+        total = sum(e.get('total_amount', 0) for e in expenses)
+        pending_sheets = await self.get_pending_approvals()
+        return {
+            'total_expenses': len(expenses),
+            'total_amount': total,
+            'pending_approval_count': len(pending_sheets),
+            'pending_amount': sum(s.get('total_amount', 0) for s in pending_sheets),
+        }
+
+    async def get_expense_by_employee(self, employee_id: int, limit: int = 20) -> list:
+        return await self._o.search_read(
+            'hr.expense',
+            [('employee_id', '=', employee_id)],
+            ['name', 'total_amount', 'date', 'state', 'product_id'],
+            limit=limit,
+        )
+
+    async def flag_for_review(self, model: str, record_id: int, reason: str, severity: str = 'medium') -> bool:
+        msg = f'[AI FLAG - {severity.upper()}] {reason}'
+        await self._o.call(model, 'message_post', [[record_id]], {'body': msg, 'message_type': 'comment'})
+        return True
+
+    async def post_chatter_note(self, model: str, record_id: int, note: str) -> bool:
+        await self._o.call(model, 'message_post', [[record_id]], {'body': note, 'message_type': 'comment'})
+        return True