feat(agent): action feedback, partial result preservation, and JS error capture

Three reliability improvements to the web automation engine:

1. Action feedback to LLM: execute_single_action now returns ActionOutcome
   with structured error messages (e.g., "selector not found: #btn").
   Failed action outcomes are injected as PREVIOUS ACTION RESULTS into the
   next round's prompt, enabling the model to self-correct.

2. Partial result preservation: LLM inference failures no longer propagate
   with `?`. Instead, accumulated extracted data, usage stats, and spawn
   pages from prior rounds are returned in AutomationResult with
   success=false, preventing data loss on transient API errors.

3. Evaluate JS error capture: JavaScript execution errors are now caught
   and surfaced through the action feedback system instead of being
   silently swallowed, giving the model visibility into its own JS mistakes.

All changes use stack-local Vec/String/Option only — no mutexes, no Arc,
no blocking. 207 tests pass with zero regressions.

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

Author: j-mendez

Cargo.lock

@@ -100,7 +100,7 @@ async fn main() {
 
 ## Benchmarks
 
-Crawling 185 pages on `rsseau.fr` ([source](./benches/BENCHMARKS.md), 10 samples averaged):
+Crawling 185 pages ([source](./benches/BENCHMARKS.md), 10 samples averaged):
 
 **Apple M1 Max** (10-core, 64 GB RAM):
 

README.md

@@ -1,6 +1,6 @@
 [package]
 name = "spider"
-version = "2.45.25"
+version = "2.45.26"
 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"
@@ -120,11 +120,11 @@ features = ["serde", "headers", "dynamic-versions"]
 
 [dependencies.spider_agent_types]
 path = "../spider_agent_types"
-version = "2.45.25"
+version = "2.45.26"
 
 [dependencies.spider_agent]
 path = "../spider_agent"
-version = "2.45.25"
+version = "2.45.26"
 optional = true
 default-features = false
 

spider/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "spider_agent"
-version = "2.45.25"
+version = "2.45.26"
 authors = ["j-mendez <jeff@spider.cloud>"]
 description = "A concurrent-safe multimodal agent for web automation and research."
 repository = "https://github.com/spider-rs/spider"
@@ -28,8 +28,8 @@ parking_lot = "0.12"
 base64 = "0.22"
 
 # Extracted types and HTML processing
-spider_agent_types = { version = "2.45.25", path = "../spider_agent_types" }
-spider_agent_html = { version = "2.45.25", path = "../spider_agent_html" }
+spider_agent_types = { version = "2.45.26", path = "../spider_agent_types" }
+spider_agent_html = { version = "2.45.26", path = "../spider_agent_html" }
 
 # HTML processing (still needed for engine internals)
 lol_html = "2"