[Repo Assist] fix: ClassifyByKeywords recognises CI/CD patterns (ci/ prefix)

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Summary

NotificationCategorizer.ClassifyByKeywords checked for "ci " (trailing space) to detect CI-related build notifications, but missed the common "CI/CD" pattern where CI is immediately followed by a slash.

Root Cause

// Before: only matches "ci " — misses "CI/CD pipeline completed"
text.Contains("ci ", StringComparison.OrdinalIgnoreCase) ||

A message like "CI/CD pipeline completed" contains "ci/" but not "ci ", so it fell through to the default "info" category instead of "build".

Fix

// After: also matches "CI/CD ..." patterns
text.Contains("ci ", StringComparison.OrdinalIgnoreCase) ||
text.Contains("ci/", StringComparison.OrdinalIgnoreCase) ||

False-positive analysis: Common English words containing ci — recipe, social, special, facial, official — are never followed by / in normal usage, so the new check introduces no false matches.

Priority note: The keyword fallback is the last-resort path. Structured metadata (Intent/Channel) takes priority and is unaffected. The fix only improves backwards-compatible plain-text message classification.

Regression Tests

Two new InlineData entries added to KeywordFallback_BackwardCompatible:

• "CI/CD pipeline completed" → "build"
• "CI/CD workflow triggered" → "build"

Test Status

Suite	Before	After
OpenClaw.Shared.Tests	525 passed, 20 skipped	527 passed, 20 skipped (+2)
OpenClaw.Tray.Tests	99 passed	99 passed (no change)

All tests pass. Only NotificationCategorizer.cs (production) and NotificationCategorizerTests.cs (test) were modified.

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