Restore techdebt review

[PerfectSlayer]

What Does This Do

This PR restores the /techdebt review to avoid pushing bloated code.

Motivation

The performance review removed the design review.

Additional Notes

Update the skill description to the new standards.

Contributor Checklist

• Format the title according to the contribution guidelines
• Assign the type: and (comp: or inst:) labels in addition to any other useful labels
• Avoid using close, fix, or any linking keywords when referencing an issue
  Use solves instead, and assign the PR milestone to the issue
• Update the CODEOWNERS file on source file addition, migration, or deletion
• Update public documentation with any new configuration flags or behaviors
• Once approved, use merge queue to merge the PR

Jira ticket: APMLP-1609

[datadog-official]

More details

This PR updates documentation and skill metadata only — no runtime code changes. It restores the /techdebt review guidance to the workflow by improving skill descriptions and reorganizing review guidelines in AGENTS.md. All changes are non-runtime and carry no behavioral risk.

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[dd-octo-sts]

🟢 Java Benchmark SLOs — All performance SLOs passed

Suite	Status
Startup	🟢 pass

SLO thresholds are defined here based on automatically generated metrics. A warning is raised when results are within 5% of the threshold.

PR vs. master results

Scenario	Candidate	master	Δ (95% CI of mean)
startup:insecure-bank:iast:Agent	13.99 s	13.93 s	[-0.3%; +1.2%] (no difference)
startup:insecure-bank:tracing:Agent	12.93 s	12.99 s	[-1.2%; +0.4%] (no difference)
startup:petclinic:appsec:Agent	16.82 s	16.69 s	[-0.1%; +1.6%] (no difference)
startup:petclinic:iast:Agent	16.86 s	16.87 s	[-1.0%; +0.8%] (no difference)
startup:petclinic:profiling:Agent	16.57 s	16.72 s	[-2.0%; +0.2%] (no difference)
startup:petclinic:sca:Agent	16.89 s	16.77 s	[-0.2%; +1.6%] (no difference)
startup:petclinic:tracing:Agent	16.08 s	16.05 s	[-0.8%; +1.2%] (no difference)

Commit: 3f8cde5e · CI Pipeline · Benchmarking Platform UI

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Load and DaCapo benchmarks can be triggered manually in the GitLab pipeline. Results will appear in the Benchmarking Platform UI after completion.

[dougqh]

I've had rather mixed results with /tech-debt on some of my performance toolkit PRs, but none-the-less, I think having this enabled by default is probably for the better.

[PerfectSlayer]

I've had rather mixed results with /tech-debt on some of my performance toolkit PRs,

Did it went against the performance improvements? Or is it more about the general feedback it provided was low quality?
In general, I expect this kind of review to run poorly with performance related changes... And consider it more like safety net to product code / logic only.

[PerfectSlayer]

Closing in favor of #12003