Add: Config for tool enable/disable, BETA warnings

Config system:
- 10 env vars to enable/disable each tool
- Disabled by default: get_deals_by_radius, get_street_deals, get_market_activity_metrics
- Enabled by default: all other tools

BETA warnings:
- analyze_market_trends: added BETA notice
- compare_addresses: added BETA notice

Tests:
- 17 tests skipped when tools disabled
- All 311 tests pass

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

nadlan_mcp/config.py

@@ -117,6 +117,52 @@ class GovmapConfig:
         default_factory=lambda: os.getenv("GOVMAP_USER_AGENT", "NadlanMCP/1.0.0")
     )
 
+    # MCP Tool Availability (enable/disable specific tools)
+    tool_autocomplete_address_enabled: bool = field(
+        default_factory=lambda: os.getenv("TOOL_AUTOCOMPLETE_ADDRESS_ENABLED", "true").lower()
+        == "true"
+    )
+    tool_get_deals_by_radius_enabled: bool = field(
+        default_factory=lambda: os.getenv("TOOL_GET_DEALS_BY_RADIUS_ENABLED", "false").lower()
+        == "true"
+    )
+    tool_get_street_deals_enabled: bool = field(
+        default_factory=lambda: os.getenv("TOOL_GET_STREET_DEALS_ENABLED", "false").lower()
+        == "true"
+    )
+    tool_get_neighborhood_deals_enabled: bool = field(
+        default_factory=lambda: os.getenv("TOOL_GET_NEIGHBORHOOD_DEALS_ENABLED", "true").lower()
+        == "true"
+    )
+    tool_find_recent_deals_for_address_enabled: bool = field(
+        default_factory=lambda: os.getenv(
+            "TOOL_FIND_RECENT_DEALS_FOR_ADDRESS_ENABLED", "true"
+        ).lower()
+        == "true"
+    )
+    tool_analyze_market_trends_enabled: bool = field(
+        default_factory=lambda: os.getenv("TOOL_ANALYZE_MARKET_TRENDS_ENABLED", "true").lower()
+        == "true"
+    )
+    tool_compare_addresses_enabled: bool = field(
+        default_factory=lambda: os.getenv("TOOL_COMPARE_ADDRESSES_ENABLED", "true").lower()
+        == "true"
+    )
+    tool_get_valuation_comparables_enabled: bool = field(
+        default_factory=lambda: os.getenv("TOOL_GET_VALUATION_COMPARABLES_ENABLED", "true").lower()
+        == "true"
+    )
+    tool_get_deal_statistics_enabled: bool = field(
+        default_factory=lambda: os.getenv("TOOL_GET_DEAL_STATISTICS_ENABLED", "true").lower()
+        == "true"
+    )
+    tool_get_market_activity_metrics_enabled: bool = field(
+        default_factory=lambda: os.getenv(
+            "TOOL_GET_MARKET_ACTIVITY_METRICS_ENABLED", "false"
+        ).lower()
+        == "true"
+    )
+
     def __post_init__(self):
         """Validate configuration after initialization."""
         self._validate()