Adapt J9JavacoreParser and tests to updated crash tracking DTOs:
- SigInfo now requires 5 parameters (added code, action, address)
- StackFrame now requires 7 parameters (added buildId, buildIdType, fileType, relativeAddress)
- ProcInfo.pid changed from String to int
- Test assertions updated for field rename (file -> path)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Integrate BuildIdCollector into J9JavacoreParser to extract build IDs
from native libraries in crash reports, matching HotspotCrashLogParser:
- Added BuildIdCollector for async build ID extraction from ELF binaries
- Modified parseNativeStackFrame() to collect library names from native frames
- Enriched stack frames with build IDs, file types, and build ID types
- Added 5-second timeout for build ID collection completion

J9 javacores include native stack frames like [libcrash.so+0x1d7d] which
now get enriched with GNU build IDs when available, improving crash
symbolication and debugging capabilities.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Code review fixes:
- Extract relative address from native stack frames ([lib+0xoffset])
- Add safe integer parsing for PID to handle malformed javacores

Matches HotspotCrashLogParser patterns for consistency.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

- Remove obsolete comment about J9 handling from Agent.java
- Separate J9 (javacore) and HotSpot (hs_err) config paths clearly
- Update javadoc to reflect actual initialization order
- Remove proactive script deployment when -Xdump not configured

J9 VMs use javacore format exclusively, not hs_err, so config
should only include javacore_path for J9 environments.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>