doc(versions): version visibility docs and Unit/Feature test split

[jfrosorio]

Description

Version-visibility docs on the default branch, plus the Laravel-convention test layout:

Docs

• README requirements table gains a Status column and links to the v2 / v1 maintenance branches (1.x row added)
• UPGRADE.md gains the 1.x → 2.0 section, so the full upgrade path (1 → 2 → 3) is discoverable from main, and a 3.0 → 3.1 section documenting the default-on redaction
• Timing/trait-guard notes in the 2.x → 3.0 section now correctly attribute those changes to 2.1
• vendor:publish snippets use a quoted, single-backslash provider argument (portable across shells)

Tests

• Tests split into tests/Unit and tests/Feature (Laravel convention) with separate PHPUnit testsuites; namespaces follow the directories
• RedactorTest parent import aliased to PHPUnitTestCase for clarity

Fixes

This fixes #15 (main part; #16 covers the v1 branch — ideally merge that first, since merging this PR auto-closes the issue).

[Copilot]

Pull request overview

Improves version visibility and upgrade documentation on the default branch by adding status/branch links in the README and expanding the upgrade guide to include the full 1→2→3 path, while also reorganizing the PHPUnit test suites/namespaces.

Changes:

• Add a “Status” column and include a 1.x row in the README requirements table, linking to v1/v2 branches.
• Extend UPGRADE.md with a 1.x → 2.0 section and update 2.x guidance; add a 3.0 → 3.1 note about default redaction behavior.
• Split PHPUnit suites into Unit/Feature directories and update test namespaces; ignore PHPUnit result cache file.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
UPGRADE.md	Adds 1.x → 2.0 section, updates 2.x messaging, and adds 3.0 → 3.1 behavioral note.
README.md	Adds a status column and v1/v2 links to the requirements table.
tests/Unit/RedactorTest.php	Moves test into Tests\\Unit namespace and avoids base TestCase collision.
tests/Feature/LogApiRequestMiddlewareTest.php	Moves test into Tests\\Feature namespace and imports package TestCase explicitly.
tests/Feature/HasApiLogsTest.php	Moves test into Tests\\Feature namespace and imports package TestCase explicitly.
phpunit.xml	Splits test suites into Unit and Feature directories.
.gitignore	Adds PHPUnit result cache to ignored files.

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