Update doc with current entry run cycle.

docs/spec/runner/run_cycle.md

@@ -0,0 +1,55 @@
+# Entry Run Cycle
+
+
+The run cycle of an entry: explanation of `skip`, `delay`, `retry`, when captures and errors are computed etc...
+
+This is the current run loop.
+
+```mermaid
+flowchart TB
+    start(["`**START**`"])
+    succeed(["`**SUCCESS**`"])
+    error(["`**ERROR**`"])
+    has_entry{Entry\nto run?}
+    options[Eval\nentry options]
+    is_skip{Is skipped?}
+    inc_entry[Inc entry index]
+    is_delay{Is delayed?}
+    sleep_delay[Sleep delay]
+    run_http[Run\nHTTP requests]
+    eval_errors[Eval errors]
+    eval_captures[Eval captures]
+    has_errors{Has errors?}
+    is_retry{Is retried?}
+    retry_interval[Sleep retry interval]
+
+    start --> has_entry
+    has_entry -. YES .-> options
+    has_entry -. NO .-> succeed 
+    options --> is_skip
+    is_skip -. YES .-> inc_entry
+    is_skip -. NO .-> is_delay 
+    inc_entry --> has_entry
+    is_delay -. YES .-> sleep_delay
+    is_delay -. NO .-> run_http
+    sleep_delay --> run_http
+    run_http --> eval_errors
+    eval_errors --> eval_captures
+    eval_captures --> has_errors
+    has_errors -. YES .-> is_retry
+    has_errors -. NO .-> inc_entry
+    is_retry -. YES ..-> retry_interval
+    is_retry -. NO .-> error
+    retry_interval --> has_entry
+
+
+    style start fill:none,stroke:#333,stroke-width:3px
+    style succeed fill:none,stroke:#333,stroke-width:3px
+    style error fill:none,stroke:#333,stroke-width:3px
+    style has_entry fill:yellow,stroke:black
+    style is_skip fill:yellow,stroke:black
+    style is_delay fill:yellow,stroke:black
+    style has_errors fill:yellow,stroke:black
+    style is_retry fill:yellow,stroke:black
+```
+