refactor(cli): split main() dispatch into per-group helper functions

[github-actions]

What was complex

main() in src/main.rs had grown to a single match on Commands spanning ~355 lines (Clippy too_many_lines threshold is 100), handling every CLI subcommand's dispatch logic inline: Compile, Check, Mcp, McpAuthor, Execute, Init, Configure, Secrets (with a nested match), Enable, Disable, Remove, List, Status, Run, Audit, Trace, five Export* commands, Inspect, Graph (nested match), Whatif, Lint, and Catalog.

What changed

Extracted four groups of match arms into standalone async/sync helper functions, each owning a cohesive slice of dispatch logic:

• dispatch_secrets_command(action: SecretsCmd) — the Secrets::{Set,List,Delete} nested match.
• dispatch_lifecycle_command(command: Commands) — Enable, Disable, Remove, List, Status, Run, Audit, Trace (all share the same org/project/pat/path REST-client shape).
• dispatch_export_command(command: Commands) — the five hidden build-time Export* commands (all synchronous generate-and-write/print operations).
• dispatch_inspect_group_command(command: Commands) — Inspect, Graph, Whatif, Lint, Catalog (read-only static-analysis commands over the compiled IR).

main() now matches on Commands and calls into these helpers for the extracted groups, keeping Compile, Check, Mcp, McpAuthor, Execute, Init, and Configure inline since they have distinct pre/post logic (guards, background update-check spawn, etc.).

No public API or observable behavior changes — every arm's body was moved verbatim into its new helper.

Before/after complexity

• Before: main() — 355 lines (clippy::too_many_lines, threshold 100)
• After: main() — 186 lines (clippy::too_many_lines); still above the lint threshold but roughly halved, and each extracted helper is a focused, independently readable/testable unit (dispatch_lifecycle_command is the largest new helper).

Verification

• cargo build --bin ado-aw — clean
• cargo test — full suite passes (all packages/binaries)
• cargo clippy --all-targets --all-features — clean (one pre-existing, unrelated warning in create_work_item.rs)

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