chore(release): 0.6.2

[Reddimus]

Summary

Releases 0.6.2: sets the CMake version, moves the [Unreleased] notes into a [0.6.2] section, adds its compare links, and points the README's FetchContent example at v0.6.2.

0.6.2 contains #65 (allocation and instruction counters in the benchmarks, with realistic fixtures), #67 (RateLimitedTransport stays inside the batch body and no longer copies each order: 26 allocations down to 6 for 20 orders), and #68 (SIGPIPE protection, macOS build fixes, and the shorter README). No public API changes.

After this merges, tagging v0.6.2 on the merge commit runs release.yml. It checks the tag against the CMake version and the CHANGELOG section, waits for CI on that commit, publishes the release, and dispatches the API reference deploy to GitHub Pages.

Checks

• tools/project_version.sh prints 0.6.2
• release.yml's extraction of the [0.6.2] section yields the notes
• make lint-docs and ./tools/test_consumers.sh pass
• SemVer impact: this is the 0.6.2 patch release

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