fix: assert equal-length worker lists in OneToOne ChannelConfig

[Ma77Ball]

What changes were proposed in this PR?

ChannelConfig.generateChannelConfigs previously used fromWorkerIds.zip(toWorkerIds) for the OneToOnePartition arm, which silently truncated to the shorter side and dropped surplus workers even though the partition's
contract is a strict 1:1 pairing. This PR adds an assert(fromWorkerIds.size == toWorkerIds.size, ...) precondition (mirroring the SinglePartition arm in the same file) so mismatched inputs fail loudly with a message that
names both sizes.

Any related issues, documentation, or discussions?

Closes: #4799

How was this PR tested?

The existing ChannelConfigSpec case that pinned the truncation behavior is flipped to assert an AssertionError is raised in both asymmetric directions (from > to and to > from). The equal-length, empty-input, and other
partition arms are unchanged and still pass. Reproducer from the report (from=3, to=2) now throws instead of returning a 2-element list.

Was this PR authored or co-authored using generative AI tooling?

Co-authored with Claude Opus 4.7 in compliance with ASF

[Ma77Ball]

/request-review @kunwp1

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.72%. Comparing base (7879c2a) to head (c8595aa).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5031      +/-   ##
============================================
- Coverage     42.73%   42.72%   -0.02%     
+ Complexity     2191     2187       -4     
============================================
  Files          1045     1045              
  Lines         39979    39982       +3     
  Branches       4218     4219       +1     
============================================
- Hits          17087    17082       -5     
- Misses        21835    21840       +5     
- Partials       1057     1060       +3     

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access-control-service	39.53% <ø> (ø)		Carriedforward from 7879c2a
agent-service	33.72% <ø> (ø)		Carriedforward from 7879c2a
amber	43.34% <100.00%> (-0.05%)	⬇️
computing-unit-managing-service	0.00% <ø> (ø)		Carriedforward from 7879c2a
config-service	0.00% <ø> (ø)		Carriedforward from 7879c2a
file-service	32.18% <ø> (ø)		Carriedforward from 7879c2a
frontend	34.04% <ø> (ø)		Carriedforward from 7879c2a
python	88.90% <ø> (ø)		Carriedforward from 7879c2a
workflow-compiling-service	47.72% <ø> (ø)		Carriedforward from 7879c2a

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