feat(consensus): cache reply payload and notify subscriber on commit

[krishvishal]

Summary

• Cache committed reply bytes per-client in ClientTable (CachedReply, refcounted Frozen buffer, Arc-bump on dedup) and deliver them to in-process subscribers via a oneshot channel embedded in PipelineEntry. Replaces the prior Notify`/pending-map indirection; awaiters no longer need a separate cache lookup after wakeup.
• ClientTable is metadata-only. Partition plane is at-least-once; consumers handle duplicates.
• New EvictionHeader / EvictionReason wire frame; typed reasons let the SDK trigger its eviction callback.
• Two-queue pipeline: prepare_queue (cap 8) plus a buffered request_queue (cap 64). is_full() reports only the prepare queue so admission stays separate from drop-on-full backpressure. View-change reset cancels subscribers and clears the request queue; the prepare queue survives for DVC reconciliation.

[codecov]

Codecov Report

❌ Patch coverage is 76.84949% with 363 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.82%. Comparing base (7c00c5d) to head (ae77e84).

Files with missing lines	Patch %	Lines
core/metadata/src/impls/metadata.rs	17.85%	134 Missing and 4 partials ⚠️
core/server-ng/src/login_register.rs	55.20%	56 Missing ⚠️
core/consensus/src/oneshot.rs	78.30%	41 Missing ⚠️
core/partitions/src/iggy_partition.rs	28.30%	35 Missing and 3 partials ⚠️
core/consensus/src/metadata_helpers.rs	92.21%	32 Missing ⚠️
core/consensus/src/impls.rs	91.79%	18 Missing and 4 partials ⚠️
core/binary_protocol/src/consensus/header.rs	82.30%	20 Missing ⚠️
core/consensus/src/lib.rs	0.00%	11 Missing ⚠️
core/consensus/src/client_table.rs	98.56%	1 Missing and 1 partial ⚠️
core/binary_protocol/src/consensus/message.rs	0.00%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3223      +/-   ##
============================================
- Coverage     73.89%   73.82%   -0.08%     
  Complexity      943      943              
============================================
  Files          1190     1193       +3     
  Lines        107988   108933     +945     
  Branches      85003    85968     +965     
============================================
+ Hits          79801    80422     +621     
- Misses        25452    25754     +302     
- Partials       2735     2757      +22     

Components	Coverage Δ
Rust Core	74.88% <76.84%> (-0.10%)	⬇️
Java SDK	60.14% <ø> (ø)
C# SDK	69.13% <ø> (-0.31%)	⬇️
Python SDK	81.43% <ø> (ø)
Node SDK	91.53% <ø> (+0.09%)	⬆️
Go SDK	39.80% <ø> (ø)

Files with missing lines	Coverage Δ
core/binary_protocol/src/consensus/command.rs	100.00% <100.00%> (ø)
core/sdk/src/session.rs	97.19% <ø> (ø)
core/simulator/src/ready_queue.rs	83.08% <ø> (ø)
core/binary_protocol/src/consensus/message.rs	49.27% <0.00%> (-0.18%)	⬇️
core/consensus/src/plane_helpers.rs	81.18% <94.73%> (-0.83%)	⬇️
core/simulator/src/lib.rs	88.11% <98.57%> (+1.88%)	⬆️
core/consensus/src/client_table.rs	95.52% <98.56%> (+1.80%)	⬆️
core/consensus/src/lib.rs	0.00% <0.00%> (ø)
core/binary_protocol/src/consensus/header.rs	78.81% <82.30%> (-2.06%)	⬇️
core/consensus/src/impls.rs	78.11% <91.79%> (+4.12%)	⬆️
... and 5 more

... and 22 files with indirect coverage changes

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