Add CLI wait output formatting with shared projection helper

[kcosr]

HTTP wait responses now support output_format for projecting captured stdout / stderr as text or JSON. Add equivalent CLI support for wait-mode command/launch output formatting, while extracting the reusable projection logic out of the HTTP module.

Scope:

• Add CLI flags for selecting output format, aligned with HTTP output_format semantics.
• Support JSON projection for selected captured streams.
• Preserve run metadata and report projection errors consistently, including invalid JSON and invalid UTF-8.
• Extract the shared captured-output projection core from gateway/http/output_projection.rs into a transport-neutral helper.
• Keep shared byte-to-projection logic separate from HTTP and CLI envelope rendering.

Notes:

• The shared helper should model projected stream results and projection errors; it should not own transport-specific envelopes.
• HTTP and CLI JSON renderers should align field names such as stdout_json, stderr_json, and output_errors where their response shapes overlap.