[thekevinbot]

Fixes #1351

'./**/.*' returned dotfiles inside dot-named directories (.cache/.z). In bash, and per docs/reference/path-tables.md, ** never enters a dot-named directory; only a component that spells it at that depth does.

The fix: a Component::DotName for components spelled with a leading .. In the walk's state machine, neither ** nor a plain component consumes a dot-named entry, so the walk prunes a dot-named directory unless a dot component at that depth matches it.

E2E Verification

• Ran e2e suites locally for every affected SDK
• Python SDK e2e: pass -- full suite (tests/e2e/), 58 passed, after merging main (Test one-level glob listings at speed of light #1317)
• TypeScript SDK e2e: pass
• Rust core e2e: cargo test --workspace --features cli: pass, except the watcher tests that are flaky locally on main (server_*_directory_moved_*, get_events_streams_mutation_events, watch_*)
• packages/python/e2e-attestations/<branch>.json written (just e2e-attest-python)
• packages/ts/e2e-attestations/<branch>.json written (just e2e-attest-ts)
• Command(s) run: just e2e-attest-python, just e2e-attest-ts, cargo test --workspace --features cli --no-fail-fast
• Result summary: by hand, ./**/.* gives .x, a/.y; ./.cache/**/.* gives .cache/.z; ./**/.cache/*.md gives .cache/m.md, a/.cache/m.md. Each matches bash -O globstar.