feat: relay operator set updates from admin to bridge subprotocol

[prajwolrg]

Description

Implements the admin → bridge interprotocol messaging path for operator set updates. When the admin subprotocol activates a queued OperatorSetUpdate, it now relays the update to the bridge subprotocol, which applies the membership changes to its operator table.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature/Enhancement (non-breaking change which adds functionality or enhances an existing one)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactor
• New or updated tests
• Dependency update
• Security fix

Notes to Reviewers

Checklist

• I have performed a self-review of my code.
• I have commented my code where necessary.
• I have updated the documentation if needed.
• My changes do not introduce new warnings.
• I have added tests that prove my changes are effective or that my feature works.
• New and existing tests pass with my changes.

Related Issues

[github-actions]

Commit: 7a41265
SP1 Execution Results

program	cycles	success
ASM STF	118,483,790	yes
Moho Recursive	11,586,699	yes

[codecov]

Codecov Report

❌ Patch coverage is 82.35294% with 9 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/msgs/bridge/src/lib.rs	0.00%	3 Missing ⚠️
crates/subprotocols/bridge-v1/src/subprotocol.rs	84.61%	2 Missing ⚠️
crates/subprotocols/debug-v1/src/subprotocol.rs	0.00%	2 Missing ⚠️
crates/txs/admin/src/actions/updates/operator.rs	75.00%	2 Missing ⚠️

Files with missing lines	Coverage Δ
crates/subprotocols/admin/src/handler.rs	95.63% <100.00%> (+0.88%)	⬆️
crates/subprotocols/bridge-v1/src/state/bridge.rs	97.67% <100.00%> (+0.15%)	⬆️
crates/subprotocols/checkpoint/src/handler.rs	84.09% <100.00%> (ø)
crates/subprotocols/bridge-v1/src/subprotocol.rs	83.05% <84.61%> (+1.05%)	⬆️
crates/subprotocols/debug-v1/src/subprotocol.rs	0.00% <0.00%> (ø)
crates/txs/admin/src/actions/updates/operator.rs	78.12% <75.00%> (+9.37%)	⬆️
crates/msgs/bridge/src/lib.rs	66.66% <0.00%> (+54.66%)	⬆️

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