Remove deprecated Coana workflows

[gjtorikian]

Summary

• Removes coana-analysis.yml and coana-guardrail.yml workflow files
• Coana is being deprecated and these workflows are no longer functional or needed

Test plan

• Verify no other workflows depend on these files

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR removes two deprecated Coana CI workflow files — a daily scheduled vulnerability scan (coana-analysis.yml) and a PR-triggered guardrail (coana-guardrail.yml). The two remaining workflows (ci.yml and release.yml) have no dependencies on these files, so the removal is clean.

Confidence Score: 5/5

• Safe to merge — straightforward removal of deprecated, non-functional workflow files with no downstream dependencies.
• Both deleted files are self-contained CI workflows with no references from the remaining ci.yml or release.yml. No application code is changed, and no custom rules are triggered.
• No files require special attention.

Important Files Changed

Filename	Overview
.github/workflows/coana-analysis.yml	Removed scheduled daily Coana vulnerability analysis workflow that ran via cron and workflow_dispatch.
.github/workflows/coana-guardrail.yml	Removed PR-triggered Coana guardrail workflow that compared vulnerability reports between base and head branches.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Pull Request / Schedule] -->|Before PR| B[coana-analysis.yml\nDaily Vuln Scan]
    A -->|Before PR| C[coana-guardrail.yml\nPR Guardrail]
    A -->|After PR| D[ci.yml]
    A -->|After PR| E[release.yml]
    B -->|Removed| X([Deleted])
    C -->|Removed| Y([Deleted])

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_{Reviews (1): Last reviewed commit: "Remove Coana workflow files" | Re-trigger Greptile}