[Parent] Compiler internals and pipeline generation improvements (IR types, YAML gen, prompt decoupling)

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Groups open issues that improve the ado-aw compiler's internals, typed IR, and pipeline YAML generation quality.

Issue	Area	Summary
#1081	IR types	Add EnvValue::RuntimeExpression to prevent $[] from leaking into step env: blocks
#987	Compile structure	Split canonical agentic-pipeline shape out of standalone_ir.rs; move Agent-job condition contributions into Declarations
#384	YAML generation	Replace manual string building in compile_gate_step_external with typed IR
#432	Runtime injection	Inject runtime parameter values into agent prompt body via ado-script (sanitization at runtime, not compile time)
#237	Output decoupling	Decouple prompt body from compiled pipeline output (runtime-import approach)

Potentially related issue noted but not linked (lower confidence — may already be implemented): #860 built-in PR context precomputation.

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