Fix agentic SDLC check: resolve @ includes, switch to informing mode

[tnierman]

Summary

Two fixes for the agentic SDLC conformance check pipeline added in #788:

1. Resolve CLAUDE.md @ includes — repos using @AGENTS.md (or similar Claude Code include directives) had content checks fail because the script only read CLAUDE.md itself. Now resolves one level of @ references, deduplicates with sort -u, and checks the combined content.

2. Add onError: continue to both check tasks so the pipeline always passes at the PipelineRun level. Non-conformance is still visible in the individual task status (red task in Konflux UI) but the overall GitHub check reports success.

What changed

Line	Change
check-file-existence task	Added onError: continue
check-content-validation task	Added onError: continue
CLAUDE.md content resolution	Resolves @ references one level deep before checking for required sections

Testing

Validated locally against openshift/deadmanssnitch-operator (which uses @AGENTS.md as its CLAUDE.md):

• Before fix: content checks fail (only sees @AGENTS.md text)
• After fix: resolves to CLAUDE.md + AGENTS.md, finds all required sections, passes 17/18 (1 advisory warning)

🤖 Generated with Claude Code

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[AlexSmithGH]

/lgtm

[clcollins]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AlexSmithGH, clcollins, tnierman

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