feat(automation): add Phase 3 agentic features - autonomous agent, action chaining, error recovery

- Add AgentConfig for goal-oriented autonomous execution
- Add execute() method for autonomous multi-step goal achievement
- Add agent() and agent_extract() convenience methods
- Add chain() method for sequential action composition
- Add ChainStep with conditional execution support
- Add ChainCondition enum (UrlContains, PageContains, ElementExists, etc.)
- Add RecoveryStrategy enum (Retry, Alternative, Skip, Abort)
- Add AgentEvent enum for progress tracking callbacks
- Add AgentResult with full execution history and extracted data
- Add ChainResult with step-by-step results and extractions
- Add plan_next_action() for LLM-based action planning
- Add check_goal_completion() for success detection
- Add comprehensive tests for all Phase 3 types
- Bump version to 2.43.13

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: j-mendez

Cargo.lock

@@ -3,7 +3,7 @@
 let
   spider = pkgs.rustPlatform.buildRustPackage {
     pname = "spider";
-    version = "2.43.12";
+    version = "2.43.13";
 
     src = ./.;
 

default.nix

@@ -1,6 +1,6 @@
 [package]
 name = "spider"
-version = "2.43.12"
+version = "2.43.13"
 authors = ["j-mendez <jeff@spider.cloud>"]
 description = "A web crawler and scraper, building blocks for data curation workloads."
 repository = "https://github.com/spider-rs/spider"