release: bump the version to 2.0.0-rc6

[robinskil]

Summary

This PR sets the version to 2.0.0-rc6. The change touches 103 files.

Crates

The workspace version becomes 2.0.0-rc.6. All 29 crates inherit this version. Cargo.lock holds the same 29 entries. The crate beacon-binary-format keeps version 2.2.0, because it holds its own version.

Clients

The package @beacon/client becomes 2.0.0-rc.6. Both lock files change. The package beacondb becomes 2.0.0rc6. The package beacon-datalake-cli becomes 2.0.0rc6. PEP 440 defines this spelling.

Docs

The command git mv renames docs/docs/2.0.0-rc5 to docs/docs/2.0.0-rc6. The 78 pages keep their history. Every link points at the new directory. LATEST_VERSION stays at 1.8.0. The path /docs/latest names the newest stable release, not the newest directory.

Tests

The command cargo test -p beacon-server --lib axum::home passes 5 tests. One test asserts that the compiled version names a docs directory that exists. The command npm run docs:build reports no dead link. The command cargo metadata --locked accepts the lock file.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.79%. Comparing base (85d06d3) to head (6bcd25f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #499      +/-   ##
==========================================
- Coverage   83.79%   83.79%   -0.01%     
==========================================
  Files         390      390              
  Lines       66523    66523              
==========================================
- Hits        55743    55741       -2     
- Misses      10780    10782       +2     

Files with missing lines	Coverage Δ
beacon-server/beacon-server/src/axum/home.rs	95.83% <100.00%> (ø)

... and 1 file with indirect coverage changes

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