feat(sdk): implement vsr header framing

[numinnex]

Adds Vsr feature flag in the sdk crate that introduces the consensus header required by the requests.
Additionally adds one hello_world test that tests the login command using the new integration test suite adapted to server-ng binary.

[codecov]

Codecov Report

❌ Patch coverage is 24.04810% with 379 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.93%. Comparing base (b03978e) to head (a2dac46).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
core/server-ng/src/bootstrap.rs	0.00%	298 Missing ⚠️
core/metadata/src/stm/user.rs	0.00%	32 Missing ⚠️
core/sdk/src/tcp/tcp_client.rs	60.00%	5 Missing and 3 partials ⚠️
core/metadata/src/impls/metadata.rs	0.00%	7 Missing ⚠️
core/server-ng/src/session_manager.rs	53.33%	7 Missing ⚠️
core/message_bus/src/client_listener/quic.rs	66.66%	0 Missing and 6 partials ⚠️
core/message_bus/src/socket_opts.rs	81.25%	0 Missing and 6 partials ⚠️
core/message_bus/src/replica/io.rs	0.00%	0 Missing and 5 partials ⚠️
core/sdk/src/websocket/websocket_client.rs	88.57%	2 Missing and 2 partials ⚠️
core/sdk/src/quic/quic_client.rs	86.95%	1 Missing and 2 partials ⚠️
... and 1 more

❌ Your patch check has failed because the patch coverage (24.04%) is below the target coverage (50.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3254      +/-   ##
============================================
- Coverage     73.80%   70.93%   -2.88%     
  Complexity      943      943              
============================================
  Files          1200     1200              
  Lines        109116   104565    -4551     
  Branches      86006    81472    -4534     
============================================
- Hits          80535    74175    -6360     
- Misses        25853    27458    +1605     
- Partials       2728     2932     +204     

Components	Coverage Δ
Rust Core	71.31% <24.04%> (-3.64%)	⬇️
Java SDK	58.44% <ø> (ø)
C# SDK	69.18% <ø> (-0.26%)	⬇️
Python SDK	81.43% <ø> (ø)
Node SDK	91.41% <ø> (-0.13%)	⬇️
Go SDK	39.91% <ø> (ø)

Files with missing lines	Coverage Δ
.../src/traits/binary_impls/personal_access_tokens.rs	100.00% <ø> (ø)
core/common/src/traits/binary_impls/users.rs	100.00% <ø> (ø)
core/message_bus/src/client_listener/tcp.rs	78.26% <100.00%> (-1.74%)	⬇️
core/message_bus/src/client_listener/tcp_tls.rs	83.78% <100.00%> (-0.84%)	⬇️
core/message_bus/src/client_listener/ws.rs	79.16% <100.00%> (-1.61%)	⬇️
core/message_bus/src/client_listener/wss.rs	83.78% <100.00%> (-0.84%)	⬇️
core/message_bus/src/replica/listener.rs	84.41% <100.00%> (-0.40%)	⬇️
core/message_bus/src/transports/quic.rs	91.76% <100.00%> (-0.25%)	⬇️
core/server-ng/src/server_error.rs	0.00% <ø> (ø)
core/sdk/src/quic/quic_client.rs	73.07% <86.95%> (+0.12%)	⬆️
... and 10 more

... and 113 files with indirect coverage changes

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[hubcio]

/ready

[hubcio]

notes on items that did not fit a line range:

• the IggyNamespace::new masking issue (namespace.rs:108-113) is upstream and not touched by this PR, but the SDK now feeds raw wire u32s straight into it (vsr.rs:187), so the silent-collision blast radius lands inside this PR. would be good to range-check at the SDK boundary even if the namespace fix lands separately.
• send_raw_with_response retry at tcp_client.rs:136-148 is pre-existing, but the new reset_vsr_session() calls at lines 548/567 turn the retry path into a silent recovery failure when auto_login=Disabled: reset clears the bound session, connect() skips re-login, next send_raw encodes with session=None and returns Unauthenticated for what looks like a transient transport error. consider gating retry on session.is_bound() under vsr, or forcing auto_login on under vsr.
• #[cfg(feature = "vsr")] is interleaved per-line across core/sdk/src/{tcp,quic,websocket}/*.rs (8 separate gates in tcp_client.rs alone). consider extracting send_legacy / send_vsr helpers per transport, or splitting the vsr framing into its own module, to reduce mis-edit hazard.

[numinnex]

@hubcio made a commit that addresses issues from those comments

[numinnex]

/review