Address code review feedback for build-and-summarize

[jbachorik]

What does this PR do?:

Fixes three bugs in the deterministic Gradle log parser inside .claude/commands/build-and-summarize (added in an uncommitted local change prior to this PR, replacing a headless-claude-spawn approach with a self-contained Python parser):

• An IndexError when a stray non-blank, non-* line appears between the FAILURE: banner and the * What went wrong: header, leaving headlines empty at index time.
• Test/module counts being misattributed under parallel Gradle builds, since they were attached to "whatever > Task line was last seen," including non-test tasks that interleave with a test task's completion line.
• Failure headlines being paired with failed tasks by list position instead of identity, so with --continue and multiple failing tasks, headlines could land on the wrong task or go missing entirely.

Also removes an unverifiable comment claiming managed settings pin a specific model and bill real money for log parsing — that claim isn't backed by anything in this file.

Motivation:

A code review of the uncommitted parser changes surfaced these correctness bugs before they shipped.

Additional Notes:

None.

How to test the change?:

Verified by hand-running the parser logic against a synthetic Gradle log that reproduces all three bugs (stray line before a headline, parallel task interleaving, multi-failure --continue output) and confirming correct output with no crash.

For Datadog employees:

• This PR doesn't touch any of that.
• JIRA: N/A

[dd-octo-sts]

Scan-Build Report

User:	runner@runnervmlun5p
Working Directory:	/home/runner/work/java-profiler/java-profiler/ddprof-lib/src/test/make
Command Line:	make -j4 all
Clang Version:	Ubuntu clang version 18.1.3 (1ubuntu1)
Date:	Thu Sep 17 10:01:13 2026

Bug Summary

Bug Type	Quantity	Display?
All Bugs	1
Logic error
Dereference of null pointer	1

Reports

Bug Group	Bug Type ▾	File	Function/Method	Line	Path Length
Logic error	Dereference of null pointer	faultInjection.cpp	crashNow	24	2

[dd-octo-sts]

CI Test Results

Run: #35208081255 | Commit: b6b97da | Duration: 15m 54s (longest job)

✅ All 32 test jobs passed

Status Overview

JDK	glibc-aarch64/debug	glibc-amd64/debug	musl-aarch64/debug	musl-amd64/debug
8	-	✅	-	-
8-ibm	-	✅	-	-
8-j9	✅	✅	-	-
8-librca	-	-	✅	✅
8-orcl	-	✅	-	-
11	-	✅	-	-
11-j9	✅	✅	-	-
11-librca	-	-	✅	✅
17	✅	✅	-	-
17-graal	✅	✅	-	-
17-j9	✅	✅	-	-
17-librca	-	-	✅	✅
21	✅	✅	-	-
21-graal	✅	✅	-	-
21-librca	-	-	✅	✅
25	✅	✅	-	-
25-graal	✅	✅	-	-
25-librca	-	-	✅	✅

Legend: ✅ passed | ❌ failed | ⚪ skipped | 🚫 cancelled

Summary: Total: 32 | Passed: 32 | Failed: 0

---

Updated: 2026-09-17 10:19:00 UTC

[dd-octo-sts]

❌ 39 passed, 1 failed out of 40 configurations

Test Matrix

Platform	JDK 8	JDK 11	JDK 17	JDK 21	JDK 25
glibc-x64-hotspot	✅	✅	✅	✅	❌
glibc-x64-openj9	✅	✅	✅	✅	✅
glibc-arm64-hotspot	✅	✅	✅	✅	✅
glibc-arm64-openj9	✅	✅	✅	✅	✅
musl-x64-hotspot	✅	✅	✅	✅	✅
musl-x64-openj9	✅	✅	✅	✅	✅
musl-arm64-hotspot	✅	✅	✅	✅	✅
musl-arm64-openj9	✅	✅	✅	✅	✅

Failure Details

glibc-x64-hotspot-jdk25

Profiler-only:

"  Skipped (tracer not expected in this configuration)"
""
"[7/8] Checking for unexpected events..."
"  ? No unexpected events found"
""
"[8/8] Scenario-specific validation (ddprof_only)..."
"  Validating profiler-only scenario..."
"  ? Profiler-only scenario checks passed"
""
"=== Validation Summary ==="
"ExecutionSample:            0.0 events (datadog.ExecutionSample)"
"Stack traces:               0.0 samples"
"Thread diversity:           0.0 threads"
"Allocation samples:         0.0 events (jdk.ObjectAllocationSample)"
"ThreadAllocationStatistics: 43 events"
""
"VALIDATION_FAILED: One or more checks did not pass"

Script executed successfully: 425 commands
VALIDATION_FAILED: Validation checks did not pass

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• 📦 Commit: cea41f4567522a1ddd52cdd034408390cc80f63f

[datadog-official]

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❌ Errors

Your PR has failed checks. Please review the issues below and take necessary action before merging.

🚦 2 Pipeline jobs failed

DataDog/java-profiler | integration-test-x64-glibc: [hotspot, 25] — 🔧 Needs a code fix, caused by this PR

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DataDog/java-profiler | post-pr-comment — 🔧 Needs a code fix, caused by this PR

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