feat(consensus): enable independent commit progress across namespaces

[hubcio]

LocalPipeline's single VecDeque blocked independent commit
progress across namespaces. NamespacedPipeline uses per-namespace
VecDeques under one global op sequence and hash chain, so
drain_committable_all drains each namespace independently.

Additional fixes: wire last_prepare_checksum through Project
and on_replicate instead of hardcoded 0; walk consecutive ops
in ack_quorum_reached to prevent premature drain; propagate
namespace in build_reply_message; enforce namespace registration
before push; add namespace field to view change headers; replace
magic-number dispatch with Operation enum in simulator.

[codecov]

Codecov Report

❌ Patch coverage is 63.95349% with 217 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.64%. Comparing base (b7818db) to head (99155e8).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
core/partitions/src/iggy_partitions.rs	0.00%	80 Missing ⚠️
core/consensus/src/plane_helpers.rs	58.16%	41 Missing ⚠️
core/consensus/src/impls.rs	28.30%	38 Missing ⚠️
core/metadata/src/impls/metadata.rs	0.00%	23 Missing ⚠️
core/simulator/src/replica.rs	0.00%	15 Missing ⚠️
core/consensus/src/namespaced_pipeline.rs	97.20%	6 Missing and 3 partials ⚠️
core/simulator/src/deps.rs	0.00%	5 Missing ⚠️
core/simulator/src/lib.rs	0.00%	5 Missing ⚠️
core/consensus/src/vsr_timeout.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2765      +/-   ##
============================================
+ Coverage     68.30%   68.64%   +0.33%     
  Complexity      656      656              
============================================
  Files           741      742       +1     
  Lines         62210    62688     +478     
  Branches      58623    59101     +478     
============================================
+ Hits          42495    43033     +538     
+ Misses        17601    17539      -62     
- Partials       2114     2116       +2     

Flag	Coverage Δ
rust	69.72% <63.95%> (+0.35%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
core/common/src/types/consensus/header.rs	17.43% <ø> (+11.00%)	⬆️
core/consensus/src/vsr_timeout.rs	64.02% <0.00%> (+11.26%)	⬆️
core/simulator/src/deps.rs	0.00% <0.00%> (ø)
core/simulator/src/lib.rs	0.00% <0.00%> (ø)
core/consensus/src/namespaced_pipeline.rs	97.20% <97.20%> (ø)
core/simulator/src/replica.rs	0.00% <0.00%> (ø)
core/metadata/src/impls/metadata.rs	17.07% <0.00%> (-0.43%)	⬇️
core/consensus/src/impls.rs	15.39% <28.30%> (+15.39%)	⬆️
core/consensus/src/plane_helpers.rs	20.56% <58.16%> (+20.56%)	⬆️
core/partitions/src/iggy_partitions.rs	0.00% <0.00%> (ø)

... and 7 files with indirect coverage changes

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