refactor(configure): reduce complexity of run in src/configure.rs

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Summary

The run function in src/configure.rs was flagged by Clippy's cognitive_complexity lint at 27/25. It was a single ~230-line async function doing five distinct jobs inline.

What changed

Five focused helper functions were extracted from run:

Helper	Responsibility
resolve_token	CLI flag → interactive password prompt
resolve_auth	PAT flag → Azure CLI token → interactive PAT prompt
resolve_ado_context	Git remote (best-effort) → apply --org/--project overrides
resolve_definitions	Explicit --definition-ids or auto-detect + ADO match
apply_token_updates	Update loop with per-definition ✓/✗ reporting

run is now a thin coordinator (~50 lines) that calls each helper in order and handles the two early-exit paths (no pipelines found, dry-run).

Behaviour

No observable behaviour changes. All existing tests pass. Each helper is individually readable and testable.

Complexity

	Before	After
run	27 (flagged)	below threshold — no longer flagged
New helpers	—	all well below 25

cargo clippy --all-targets --all-features --message-format=json -- \
  -W clippy::cognitive_complexity \
  | jq '... select(.file == "src/configure.rs")'
# → no output

Generated by Cyclomatic Complexity Reducer · ● 841.4K · ◷