Add HTTPS default tunnel endpoint and outbound connector using Rustls
with mTLS and an additional auth/session token.
- Add rustls, tokio-rustls, hyper, and related dependencies
- Implement TLS config builders (server/client) with cert validation
- Implement HTTPS tunnel listener with mTLS accept and auth handshake
- Implement HTTPS tunnel connector with server cert validation
- Add auth token loading from CLI value or file
- Add security gate state machine for tracking auth progression
- Fail closed for missing/invalid TLS config, cert mismatch, auth failures
- Port conflicts fail without fallback
- Reconnect revalidates all security gates
- 67 tests covering all validation assertions
- Make CI smoke commands Windows-aware by using OS-neutral cargo run invocations
- Replace masked negative smoke checks (|| true) with explicit non-zero assertions
- Remove Cargo.lock from .gitignore and track for binary reproducibility
- Strengthen secret redaction to eliminate stable first/last character leakage
- Remove readme field from Cargo.toml that referenced a missing README.md
c4ch3c4d3