test: cover DispatchProcessor commit safety across recovery-step exceptions

[ruslanvelkov-beep]

Description

Adds regression-guard unit tests for DispatchProcessor proving that a handle-time failure never
leaves committed state inconsistent with a non-SUCCESS receipt.

processDispatch runs tryHandle(...) (which catches HandleException/ThrottleException/generic
Exception and rolls the stack back on failure), then finalizeAndSaveUsage/finalizeRecord, and
finally commitFullStack() as an ordinary last statement (no try/finally). So on a handled failure
the commit publishes an empty stack, and if any recovery/pre-commit step itself throws, the exception
escapes processDispatch and the commit is skipped entirely — a skipped commit writes nothing, never a
partial write.

Tests added (no production code changed)

DispatchProcessorTest:

• failedDispatchCommitsTheRolledBackStackSoReceiptMatchesState — on a handled failure, asserts (in
  order) stack.rollbackFullStack() runs before stack.commitFullStack(), so the non-SUCCESS receipt
  is paired with an empty committed stack.
• noStateIsCommittedWhenAnyRecoveryStepThrows — a parameterized matrix injecting each of several
  unchecked exception types (RuntimeException, IllegalStateException, IllegalArgumentException,
  ArithmeticException, NullPointerException, ClassCastException) at each recovery/pre-commit step
  (rollbackFullStack, resetRefundableFees, reverseAccumulatedNodeFees, finalizeAndSaveUsage,
  finalizeRecord); every combination propagates out of processDispatch and commitFullStack() is
  never invoked. (The recovery path declares no checked exceptions, so these exhaust its surface.)

Related issue(s)

N/A

[lfdt-bot]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff            @@
##               main   #26961   +/-   ##
=========================================
  Coverage     70.50%   70.50%           
  Complexity    11692    11692           
=========================================
  Files          2586     2586           
  Lines        108484   108484           
  Branches      12146    12146           
=========================================
  Hits          76490    76490           
  Misses        28014    28014           
  Partials       3980     3980           

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[testlens-app]

✅ All tests passed ✅

🏷️ Commit: 8bbc9e7
▶️ Tests: 11082 executed
⚪️ Checks: 37/37 completed

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