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

[krishvishal]

Summary

• Cache committed reply bytes per-client in ClientTable (CachedReply, refcounted Frozenbuffer, Arc-bump on dedup) and deliver them to in-process subscribers via a oneshot channel embedded inPipelineEntry. 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 78.37134% with 332 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.47%. Comparing base (140f3c5) to head (63b62c8).

Files with missing lines	Patch %	Lines
core/metadata/src/impls/metadata.rs	17.85%	134 Missing and 4 partials ⚠️
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/server-ng/src/register_submitter.rs	0.00%	17 Missing ⚠️
core/consensus/src/lib.rs	0.00%	11 Missing ⚠️
core/server-ng/src/login_register.rs	89.33%	6 Missing and 2 partials ⚠️
core/consensus/src/client_table.rs	98.56%	1 Missing and 1 partial ⚠️
... and 3 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3223      +/-   ##
============================================
- Coverage     74.48%   74.47%   -0.01%     
  Complexity      943      943              
============================================
  Files          1188     1192       +4     
  Lines        106530   107619    +1089     
  Branches      83560    84666    +1106     
============================================
+ Hits          79350    80154     +804     
- Misses        24433    24679     +246     
- Partials       2747     2786      +39     

Components	Coverage Δ
Rust Core	75.74% <78.37%> (-0.01%)	⬇️
Java SDK	60.14% <ø> (ø)
C# SDK	69.07% <ø> (-0.31%)	⬇️
Python SDK	81.43% <ø> (ø)
Node SDK	91.53% <ø> (ø)
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/server-ng/src/login_register.rs	91.08% <89.33%> (+1.48%)	⬆️
core/consensus/src/lib.rs	0.00% <0.00%> (ø)
core/server-ng/src/register_submitter.rs	0.00% <0.00%> (ø)
... and 6 more

... and 23 files with indirect coverage changes

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