docs: rename TestBox to WheelsTest across forward-looking docs (#2127)

Repo-wide sweep applying the three-bucket rename rubric to 20 forward-
looking documentation files. Companion to #2125 (comparison doc) and
#2126 (audit + CHANGELOG follow-up).

Rubric applied:
  1. Current framework identity → rename to WheelsTest
  2. BDD style/pattern name → drop TestBox qualifier, use "BDD syntax"
  3. Historical / rename-event / upstream-project references → preserved

Files updated (20 total):
  - docs/wheels-vs-frameworks.md
  - CLAUDE.md, CONTRIBUTING.md
  - docs/src/working-with-wheels/{directory-structure,end-to-end-testing,
    browser-testing}.md
  - docs/src/command-line-tools/cli-guides/testing.md
  - tests/README.md
  - .ai/wheels/testing/{browser-testing,unit-testing}.md
  - .ai/wheels/{views,controllers,models}/testing.md
  - examples/{README,starter-app/README,tweet/AGENTS}.md
  - examples/tweet/.claude/skills/{README,SKILLS-QUICK-START}.md
  - packages/{legacyadapter/README,sentry/CLAUDE}.md

Legitimate retentions (per rubric bucket 3):
  - "formerly TestBox" history notes in CONTRIBUTING.md
  - Upstream URL labels pointing to testbox.ortusbooks.com
    (framed as "Upstream TestBox Docs" for BDD syntax reference)
  - this.testbox CFML Application.cfc property (back-compat convention)
  - /tmp/testbox_results.json temp-file names in shell examples

CLI command updates where code paths exist:
  - `box testbox run` → `wheels test run` in tests/README.md and
    examples/starter-app/README.md (matches Wheels CLI canonical form
    per CLAUDE.md's testing quick reference)

Upstream reference reframing in .ai/wheels/{views,controllers,models}/
testing.md: "Modern TestBox Resources" section retitled to "BDD Reference
— Upstream TestBox Docs" with explicit note that WheelsTest inherits the
BDD syntax from upstream Ortus TestBox.

Deferred to editorial follow-up PRs (complex mix of stale code,
CommandBox commands, URLs, and prose requiring verification):
  - docs/src/working-with-wheels/testing-your-application.md (39 refs)
  - cli/WHEELS-CLI-ROADMAP.md (15 refs)
  - examples/tweet/.{claude/commands,opencode/command}/wheels_execute.md

Out of scope (historical planning artifacts, per rubric bucket 3):
  - docs/superpowers/plans/**
  - docs/superpowers/specs/**

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: bpamiri

CLAUDE.md

@@ -26,7 +26,7 @@ packages/sentry/
 ├── box.json               # CommandBox package metadata
 ├── README.md              # User-facing documentation
 └── tests/
-    └── SentrySpec.cfc     # TestBox BDD specs
+    └── SentrySpec.cfc     # WheelsTest BDD specs
 ```
 
 ## Configuration