Tunnellio v0.1.6

Summary

This release aligns the client with the new Tunnellio discovery, auth, and session contract.
The client now reflects the server's final auth/connection contract, supports OAuth discovery helpers, and keeps richer runtime/session metadata.
Release validation included local source checks, the expanded manual suite, and live plan/session verification against test.tunnellio.site.

Added OAuth discovery helpers and PKCE utilities.
Added session-aware runtime handling for open, heartbeat, resume, close, and complete flows.
Added resume-token aware heartbeat/close handling and richer runtime snapshot metadata.
Expanded config, planner, tests, and documentation for the new server contract.

The server remains the source of truth for the final authMode and connectionMode; callers should read the returned runtime snapshot instead of assuming requested modes were granted unchanged.
For random or ephemeral domains, launch with a runtime name and then call show-config --name <runtime> to read back the final server-side hostname and public URL.
The ready binary is Windows-specific; the source archive is the portable project package for Python/OpenSSH environments.

Aligned the client with the new discovery, auth, and session contract.
Added OAuth discovery helpers, PKCE utilities, and extended session-aware planning/runtime metadata.
Added live-validated session lifecycle handling with resume-token aware heartbeat, resume, and close calls.
Expanded config, runtime snapshots, tests, and docs for the new server contract.

Upload both tunnellio.exe and tunnellio-source-v0.1.6.zip from this folder.
Reuse this Markdown as the GitHub release body.
Publish the release from the main commit for v0.1.6 after creating the GitHub release.