feat: add snyk code issues workflow

[fsargent]

Description

Adds a read-only snyk code issues workflow for browsing existing Snyk Code issues without starting a new scan.

This command is intended as the missing discovery step for bulk ignore workflows and agent-assisted repo maintenance. It can either use an explicit --project-id or resolve the Snyk Code project from the current folder by inferring git origin and branch, resolving the matching Snyk target/project, then listing Code issues from the REST API.

The workflow supports table and JSON output, ignored issue filtering, severity threshold filtering, limit/all pagination behavior, and preserves raw API data needed by later automation.

Context: this came out of the Group 7 R&D onsite hackathon after validating that snyk ignore create already creates a remote Code Consistent Ignore for one finding, but there is no bulk-friendly way to first browse and select existing findings. NASDAQ has also asked for this kind of bulk Code ignore management flow.

Related: CC-1252

Checklist

• Tests added and all succeed
• Linted
• README.md updated, if user-facing — not included in this client PR; CLI docs/help follow-up is needed when the CLI consumes this client version.

🚨After having merged, please update the snyk-ls and CLI go.mod to pull in latest client.

[fsargent]

• feat: add code issues workflow for listing Snyk Code issues #157
• feat: add snyk code issues workflow #156 👈 (View in Graphite)
• main

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[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

💻 Catch issues earlier using the plugins for VS Code, JetBrains IDEs, Visual Studio, and Eclipse.

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

💻 Catch issues earlier using the plugins for VS Code, JetBrains IDEs, Visual Studio, and Eclipse.