[TrapsterDK]

Closes #6211

dx init ./ now means the current directory, the same as dx init ..

validate_init_dir strips ./ and then /. When nothing is left, it returns the current directory instead of splitting an empty path into one empty segment.

Changes:

• cli/adopt/src/init_dir.rs: return "" when the directory is empty after the strips.
• Same file, test current_directory_spellings_mean_no_subdirectory: add ./.

Not changed: repeated ./ prefixes (././) stay refused, as the issue allowed. / stays refused as an absolute path.

Checks:

• tools/dx check --apply //cli/adopt/...: exit 0.
• tools/dx test //cli/adopt/...: 2 pass, 1 fails: overrides::tests::table_matches_the_repo_module_bazel (gcc_toolchain patch list). It is in overrides.rs, which this change does not touch; not verified on main.
• Not run: nested-Bazel and *_consumer_test targets (CI runs them).
• Remaining for other platforms: none. The change is platform-independent.

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