chore: Shorten job names to stay within Linux 15-char thread limit

[vlntb]

High Level Overview of Change

Linux limits thread names to 15 characters (plus null terminator). Job names that include ledger sequences were exceeding this limit, causing assertion failures.

Dynamic job names constructed with ledger sequences (e.g., "OrderBookUpd" + seq) can exceed 15 characters as ledger numbers grow.

Fixes:

1. OrderBookDBImpl.cpp:61 - Shortened prefix from "OrderBookUpd" (13 chars) to "OBUpd" (5 chars)
2. LedgerPersistence.cpp:75 - Added prefix "Pub" (3 chars) to bare sequence numbers

Result: Both job names now guaranteed to stay within 15-character limit:

• "OBUpd" + seq: max 15 chars (supports up to 10-digit sequences)
• "Pub" + seq: max 15 chars (supports up to 12-digit sequences)

API Impact

• Public API: New feature (new methods and/or new fields)
• Public API: Breaking change (in general, breaking changes should only impact the next api_version)
• libxrpl change (any change that may affect libxrpl or dependents of libxrpl)
• Peer protocol change (must be backward compatible or bump the peer protocol version)

[xrplf-ai-reviewer]

No issues.

Review by Claude Opus 4.6 · Prompt: V12

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 81.5%. Comparing base (2c765f6) to head (272cc17).
⚠️ Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/xrpld/app/ledger/OrderBookDBImpl.cpp	0.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #6669   +/-   ##
=======================================
  Coverage     81.4%   81.5%           
=======================================
  Files          998     998           
  Lines        74443   74443           
  Branches      7563    7558    -5     
=======================================
+ Hits         60632   60634    +2     
+ Misses       13811   13809    -2     

Files with missing lines	Coverage Δ
src/xrpld/app/ledger/detail/LedgerPersistence.cpp	83.3% <100.0%> (ø)
src/xrpld/app/ledger/OrderBookDBImpl.cpp	78.9% <0.0%> (ø)

... and 2 files with indirect coverage changes

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