docs: add missing endpoints and update filter params

Add documentation for Offices, Organizations, OTAs, OTIDVs, Subawards,
NAICS, Assistance, GSA eLibrary Contracts, and Protests endpoints.
Update Entities, Forecasts, Opportunities, Notices, and Grants with
full explicit filter parameters. Add PROTESTS_MINIMAL and
GSA_ELIBRARY_CONTRACTS_MINIMAL to ShapeConfig table. Update README
with new endpoint examples and project structure.

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

Author: vdavez

README.md

@@ -6,7 +6,7 @@ A modern Python SDK for the [Tango API](https://tango.makegov.com) by MakeGov, f
 
 - **Dynamic Response Shaping** - Request only the fields you need, reducing payload sizes by 60-80%
 - **Full Type Safety** - Runtime-generated TypedDict types with accurate type hints for IDE autocomplete
-- **Comprehensive API Coverage** - All major Tango API endpoints (contracts, entities, forecasts, opportunities, notices, grants, webhooks) [Note: the current version does NOT implement all endpoints, we will be adding them incrementally]
+- **Comprehensive API Coverage** - All major Tango API endpoints (contracts, IDVs, OTAs, entities, forecasts, opportunities, notices, grants, protests, webhooks, and more)
 - **Flexible Data Access** - Dictionary-based response objects with validation
 - **Modern Python** - Built for Python 3.12+ using modern async-ready patterns
 - **Production-Ready** - Comprehensive test suite with VCR.py-based integration tests
@@ -152,14 +152,33 @@ contracts = client.list_contracts(
 **Response Options:**
 - `shape`, `flat`, `flat_lists` - Response shaping options
 
+### IDVs, OTAs, OTIDVs
+
+```python
+# List IDVs (keyset pagination)
+idvs = client.list_idvs(limit=25, awarding_agency="4700")
+
+# Get single IDV with shaping
+idv = client.get_idv("IDV_KEY", shape=ShapeConfig.IDVS_COMPREHENSIVE)
+
+# OTAs and OTIDVs follow the same pattern
+otas = client.list_otas(limit=25)
+otidvs = client.list_otidvs(limit=25)
+```
+
+### Vehicles
+
+```python
+vehicles = client.list_vehicles(search="GSA schedule", shape=ShapeConfig.VEHICLES_MINIMAL)
+vehicle = client.get_vehicle("UUID", shape=ShapeConfig.VEHICLES_COMPREHENSIVE)
+awardees = client.list_vehicle_awardees("UUID")
+```
+
 ### Entities (Vendors/Recipients)
 
 ```python
-# List entities
-entities = client.list_entities(
-    page=1,
-    limit=25
-)
+# List entities with filters
+entities = client.list_entities(search="Booz Allen", state="VA", limit=25)
 
 # Get specific entity by UEI or CAGE code
 entity = client.get_entity("ZQGGHJH74DW7")
@@ -168,47 +187,50 @@ entity = client.get_entity("ZQGGHJH74DW7")
 ### Forecasts
 
 ```python
-# List contract forecasts
-forecasts = client.list_forecasts(
-    agency="GSA",
-    limit=25
-)
+forecasts = client.list_forecasts(agency="GSA", fiscal_year=2025, limit=25)
 ```
 
 ### Opportunities
 
 ```python
-# List opportunities/solicitations
-opportunities = client.list_opportunities(
-    agency="DOD",
-    limit=25
-)
+opportunities = client.list_opportunities(agency="DOD", active=True, limit=25)
 ```
 
 ### Notices
 
 ```python
-# List contract notices
-notices = client.list_notices(
-    agency="DOD",
-    limit=25
-)
+notices = client.list_notices(agency="DOD", notice_type="award", limit=25)
 ```
 
 ### Grants
 
 ```python
-# List grant opportunities
-grants = client.list_grants(
-    agency_code="HHS",
-    limit=25
-)
+grants = client.list_grants(agency="HHS", status="forecasted", limit=25)
+```
+
+### Protests
+
+```python
+protests = client.list_protests(source_system="gao", outcome="Sustained", limit=25)
+protest = client.get_protest("CASE_UUID")
+```
+
+### GSA eLibrary Contracts
+
+```python
+contracts = client.list_gsa_elibrary_contracts(schedule="MAS", limit=25)
+contract = client.get_gsa_elibrary_contract("UUID")
 ```
 
-### Business Types
+### Reference Data
 
 ```python
-# List business types
+# Offices, organizations, NAICS, subawards, assistance, business types
+offices = client.list_offices(search="acquisitions")
+organizations = client.list_organizations(level=1)
+naics = client.list_naics(search="software")
+subawards = client.list_subawards(prime_uei="UEI123")
+assistance = client.list_assistance(fiscal_year=2025)
 business_types = client.list_business_types()
 ```
 
@@ -417,13 +439,21 @@ tango-python/
 │       ├── conftest.py      # Integration test fixtures
 │       ├── validation.py    # Validation utilities
 │       ├── test_agencies_integration.py
+│       ├── test_assistance_integration.py
 │       ├── test_contracts_integration.py
 │       ├── test_entities_integration.py
 │       ├── test_forecasts_integration.py
 │       ├── test_grants_integration.py
+│       ├── test_naics_integration.py
 │       ├── test_notices_integration.py
+│       ├── test_offices_integration.py
 │       ├── test_opportunities_integration.py
+│       ├── test_organizations_integration.py
+│       ├── test_otas_otidvs_integration.py
+│       ├── test_protests_integration.py
 │       ├── test_reference_data_integration.py
+│       ├── test_subawards_integration.py
+│       ├── test_vehicles_idvs_integration.py
 │       └── test_edge_cases_integration.py
 ├── docs/                     # Documentation
 │   ├── API_REFERENCE.md     # Complete API reference