[#756] Made accessibility console summary opt-in via 'BEHAT_ACCESSIBILITY_PRINT'.

[AlexSkrypnyk]

Closes #756

Summary

AccessibilityTrait used to unconditionally fwrite(STDOUT, ...) a one-line per-page summary every time a page was assessed, so any consumer's console output was cluttered with [accessibility] <url>: N violations, ... lines it never asked for. Console printing is now opt-in: a new protected getter, accessibilityGetPrintCli(), guards the fwrite call, and its default implementation returns TRUE only when the BEHAT_ACCESSIBILITY_PRINT environment variable is set to a non-empty value other than 0. Consumers can also override the getter to hardcode either behaviour. HTML, JUnit, and aggregate reports are unaffected; only the STDOUT line is gated.

Changes

• src/AccessibilityTrait.php: Added the protected accessibilityGetPrintCli() getter, wrapped the existing fwrite(STDOUT, ...) summary in a call to it, and extended the trait docblock with a new "Console output" section documenting the opt-in behaviour and the BEHAT_ACCESSIBILITY_PRINT environment variable.
• tests/behat/features/accessibility.feature: Added two Behat-in-Behat @trait:AccessibilityTrait scenarios covering the default-silent path and the BEHAT_ACCESSIBILITY_PRINT-enabled path.
• STEPS.md: Regenerated from the updated trait docblock so the new "Console output" section is reflected in the published documentation.

Before / After

BEFORE                                    AFTER
──────                                    ─────
Page assessed                             Page assessed
      │                                         │
      ▼                                         ▼
fwrite(STDOUT, ...)                       accessibilityGetPrintCli()
      │                                         │
      ▼                                   ┌─────┴─────┐
"[accessibility] <url>:                   │           │
 N violations, N passes,                FALSE        TRUE
 N incomplete (rules: ...)"          (default:    (BEHAT_ACCESSIBILITY_PRINT
                                     env unset      set to a non-empty,
Printed on every run,                or "0")        non-"0" value)
regardless of consumer need              │           │
                                          ▼           ▼
                                    No STDOUT    fwrite(STDOUT, ...)
                                     output      "[accessibility] <url>:
                                                   N violations, ..."

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📥 Commits

Reviewing files that changed from the base of the PR and between 7224e7a and 8208061.

📒 Files selected for processing (3)

• STEPS.md
• src/AccessibilityTrait.php
• tests/behat/features/accessibility.feature

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.40%. Comparing base (7224e7a) to head (8208061).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #757   +/-   ##
=======================================
  Coverage   97.40%   97.40%           
=======================================
  Files          52       52           
  Lines        4552     4555    +3     
=======================================
+ Hits         4434     4437    +3     
  Misses        118      118           

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