docs: add deep dive article on flow control and reasoning block behavior (#12)

* docs: add deep dive article on flow control and reasoning block behavior

Add a detailed walkthrough of AgentScript's two-phase execution model
(deterministic parse vs. LLM reasoning), covering primitives, flow of
control diagrams, a turn-by-turn example conversation with compiled
prompts and tool visibility, observability traces, and behavioral
observations about pipe-prefixed instructions.

Includes 4 diagrams/screenshots and a companion .agent file.

* docs: fix linting errors in companion agentscript.agent file

Author: NikhilKGupta

apps/docs/docs/dialects/agentforce/ascript-deep-dive-flow.md

@@ -66,6 +66,7 @@ const sidebars: SidebarsConfig = {
             'dialects/agentforce/ascript-lang',
             'dialects/agentforce/ascript-blocks',
             'dialects/agentforce/ascript-flow',
+            'dialects/agentforce/ascript-deep-dive-flow',
             'dialects/agentforce/ascript-manage',
             {
               type: 'category',