[codex] Group compatibility suites by upstream package

[bertysentry]

What changed

This PR groups the compatibility integration suites by upstream family so the Failsafe report aggregates results more clearly.

• moved the BWK suites into io.jawk.onetrueawk
• moved the gawk suites into io.jawk.gawk
• moved the POSIX suite into io.jawk.posix as PosixIT
• made CompatibilityTestResources a small shared helper across those packages
• updated the compatibility documentation to describe the new grouping

Why

The compatibility suites now come from three distinct upstream sources: BWK / One True Awk, the POSIX awk specification, and GNU Awk. Grouping them by package makes the Failsafe and site reports easier to read and keeps the code structure aligned with those sources.

Impact

• mvn test still excludes the compatibility suites
• mvn verify still runs them under Failsafe
• Failsafe reports now group results under io.jawk.onetrueawk.*, io.jawk.posix.*, and io.jawk.gawk.*

Validation

• mvn license:update-file-header
• mvn formatter:format
• mvn test
• mvn verify

[Copilot]

Pull request overview

This PR reorganizes the compatibility integration test suites into upstream-specific Java packages (BWK/One True Awk, POSIX, GNU Awk) to improve Failsafe report aggregation and aligns documentation with the new structure.

Changes:

• Moved BWK integration suites into io.jawk.onetrueawk, gawk suites into io.jawk.gawk, and POSIX suite into io.jawk.posix (as PosixIT).
• Promoted CompatibilityTestResources into a small shared public helper for resolving vendored IT resources across packages.
• Updated compatibility site documentation to reflect the new suite grouping and sources.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/site/markdown/compatibility.md	Documents the three upstream compatibility sources and the new package-based grouping.
src/it/java/io/jawk/posix/PosixIT.java	Moves POSIX integration tests into a dedicated package and updates suite naming/docs.
src/it/java/io/jawk/onetrueawk/BwkTIT.java	Moves BWK text-processing suite into io.jawk.onetrueawk and updates imports/docs.
src/it/java/io/jawk/onetrueawk/BwkPIT.java	Moves BWK pattern suite into io.jawk.onetrueawk and updates imports/docs.
src/it/java/io/jawk/onetrueawk/BwkMiscIT.java	Moves BWK misc suite into io.jawk.onetrueawk and updates imports/docs.
src/it/java/io/jawk/gawk/GawkOptionalFeatureIT.java	Moves gawk optional-feature suite into io.jawk.gawk and updates docs/imports.
src/it/java/io/jawk/gawk/GawkLocaleIT.java	Moves gawk locale suite into io.jawk.gawk and updates docs/imports.
src/it/java/io/jawk/gawk/GawkIT.java	Moves core gawk suite into io.jawk.gawk and updates docs/imports.
src/it/java/io/jawk/gawk/GawkExtensionIT.java	Moves gawk extension suite into io.jawk.gawk and updates docs/imports.
src/it/java/io/jawk/gawk/AbstractGawkSuite.java	Moves shared gawk suite base class into io.jawk.gawk and uses shared resource helper.
src/it/java/io/jawk/CompatibilityTestResources.java	Makes resource resolution helper public/static for cross-package IT reuse.

Comments suppressed due to low confidence (1)

src/it/java/io/jawk/posix/PosixIT.java:965

• System.getenv() lookups on Windows are case-insensitive, but Jawk’s ENVIRON is populated using the exact keys from System.getenv().entrySet() (see AVM ENVIRON_OFFSET implementation). On Windows the PATH variable is commonly exposed as Path, so ENVIRON["PATH"] may print an empty string while System.getenv().get("PATH") returns a value, making this test fail on Windows. Consider either reverting to a consistently-cased variable name (and setting it via Failsafe config), or dynamically selecting the actual env key casing (e.g., find the key equalIgnoreCase("PATH") and use that exact key in both the script and expected value).

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