Bump version to 0.2.0

Exemplar updates since 2026-04-27

Updated infra and moved INSTALL_GTEST parameter into lockfile.json cmake_args (exemplar ab5c7c0c).
Raise gtest_discover_tests DISCOVERY_TIMEOUT to 60s (exemplar 4aaeaa1e).
Add vcpkg port templates, manifest, vcpkg-configuration.json, vcpkg CI/release workflows, README/CONTRIBUTING updates, BEMAN_USE_FETCH_CONTENT_ENABLED flag, and bump infra-workflows from 1.5.3 to 1.6.0 (exemplar c29676b5).
Bump vcpkg registry baselines (exemplar a8a97fde).
Removed superfluous comments around project() statement in CMakeLists.txt
Add .swp and .orig to .gitignore (exemplar 56120a71).
Bump infra/ beman-submodule to latest, generalizing BemanExemplar_/BEMAN_EXEMPLAR_LOCKFILE identifiers to Beman_/BEMAN_LOCKFILE and refreshing README, llvm-libc++ toolchain SPDX, and telemetry.sh typo (exemplar 01312794).