fix(cluster): recover writes after a fast partition primary rejoin

[spetz]

A fast partition primary rejoin could leave the group unable to
commit new writes. A backup could adopt suffix headers without
obtaining their bodies because repair stopped at commit_max. Clients
then handled the typed non-admission response by checking metadata
leadership, even though metadata and partition groups can elect
different primaries.

Extend suffix repair to the available frontier and clear completed
sessions after the later commit catches up. Reject writes on stale
backups before local offset validation, so callers receive the typed
response required for safe rerouting.

Add one-pass roster routing for HTTP and the Rust, Node, Go, Java,
and C# clients. Coordinate concurrent Rust reconnects and prevent
ambiguous replicated writes from being replayed under a new session.

[codecov]

Codecov Report

❌ Patch coverage is 88.68421% with 172 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.69%. Comparing base (90e38b1) to head (377247c).

Files with missing lines	Patch %	Lines
core/sdk/src/tcp/tcp_client.rs	82.06%	26 Missing and 7 partials ⚠️
core/sdk/src/websocket/websocket_client.rs	76.08%	27 Missing and 6 partials ⚠️
core/sdk/src/quic/quic_client.rs	75.26%	19 Missing and 4 partials ⚠️
core/sdk/src/leader_aware.rs	94.72%	13 Missing and 7 partials ⚠️
core/server/src/http/forward.rs	86.57%	16 Missing and 4 partials ⚠️
...IggyClient/Implementations/TcpMessageStream.Vsr.cs	71.18%	10 Missing and 7 partials ⚠️
.../apache/iggy/client/async/tcp/LeaderAwareness.java	64.70%	2 Missing and 4 partials ⚠️
core/shard/src/lib.rs	94.68%	5 Missing ⚠️
...ache/iggy/client/async/tcp/AsyncIggyTcpClient.java	76.19%	3 Missing and 2 partials ⚠️
foreign/go/client/tcp/tcp_core.go	80.95%	2 Missing and 2 partials ⚠️
... and 2 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3987      +/-   ##
============================================
- Coverage     84.63%   83.69%   -0.94%     
- Complexity     1398     1405       +7     
============================================
  Files          1224     1224              
  Lines        176637   177971    +1334     
  Branches     143161   144285    +1124     
============================================
- Hits         149491   148956     -535     
- Misses        23173    25076    +1903     
+ Partials       3973     3939      -34     

Components	Coverage Δ
Rust Core	85.64% <89.09%> (+0.01%)	⬆️
Java SDK	67.35% <75.55%> (+0.11%)	⬆️
C# SDK	52.48% <73.84%> (-22.91%)	⬇️
Python SDK	90.06% <ø> (ø)
PHP SDK	85.65% <ø> (ø)
Node SDK	96.24% <98.30%> (+1.85%)	⬆️
Go SDK	69.29% <87.30%> (+0.19%)	⬆️

Files with missing lines	Coverage Δ
core/partitions/src/iggy_partition.rs	88.58% <100.00%> (+0.51%)	⬆️
core/partitions/src/journal.rs	89.25% <100.00%> (+0.72%)	⬆️
core/partitions/src/types.rs	48.95% <ø> (ø)
core/sdk/src/vsr.rs	94.01% <100.00%> (+0.10%)	⬆️
core/server/src/http.rs	93.31% <100.00%> (+0.19%)	⬆️
core/server/src/partition_reconciler.rs	97.96% <100.00%> (-0.31%)	⬇️
...SDK/IggyClient/Implementations/TcpMessageStream.cs	44.52% <100.00%> (-36.48%)	⬇️
...ache/iggy/client/async/tcp/AsyncTcpConnection.java	74.69% <100.00%> (+0.24%)	⬆️
foreign/node/src/client/client.socket.ts	97.50% <100.00%> (+0.19%)	⬆️
foreign/node/src/client/client.connection.ts	97.31% <93.75%> (-0.18%)	⬇️
... and 11 more

... and 92 files with indirect coverage changes

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[spetz]

/ready

[spetz]

/ready