Print NDK revision for verbose ndk-env

[StantonMatt]

Related to #192; this is the verbose-output side, separate from #207's env-var export.

cargo ndk already reports the detected NDK revision in verbose output, and cargo ndk-env uses the same NDK detection path but did not surface it. This adds accepted -v / --verbose and -q / --quiet flags to ndk-env, then prints the detected NDK revision/path on stderr in verbose mode so shell exports and JSON stdout stay clean by default.

Validation:

• cargo fmt --all -- --check
• git diff --check
• fake-NDK smoke checks for default JSON output, -v stderr detection output, and --quiet --verbose suppression
• cargo test --locked
• cargo clippy -- -D warnings
• review-fix-loop: clean (I did not find any actionable correctness issues)

[StantonMatt]

Closing this in favor of #207, which solves the same issue more directly by exposing the detected revision as CARGO_NDK_NDK_VERSION in ndk-env output and already has the same green CI matrix. I opened this while working the same issue and do not want to leave two competing fixes open.