analyze_cmd.cpp now has three modes (histograms, sample, NDV) with duplicated validation and plumbing. SERVER-131758 extracted the shared pieces (validateKeyPath, acquireAndValidateCollection) and made typedRun a simple three-way dispatch, but deferred the broader cleanup to avoid changing existing behavior.

Scope:

• Restructure the modes around an internal AnalyzeModeHandler interface with three implementations, including one registered command, as suggested by calonso. 

• Unify the remaining collection validation (capped, normal/clustered checks, and stats tracker placement) after agreeing on the correct shared behavior.

• Replace the histograms path’s internal client flip with the exception safe ScopeGuard pattern already used by NDV.

Context: review threads on PR #60109