feat(mcp): [TKC-6706] add formatters for boards and rendered reports

[vsukhin]

Compact views of a board list, a board with its reports in dashboard order, and each report kind's rendered data. The insight series summary is factored out so time-series reports reuse it.

Pull request description

Checklist (choose whats happened)

• breaking change! (describe)
• tested locally
• tested on cluster
• added new dependencies
• updated the docs
• added a test

Breaking changes

Changes

Fixes

[testkubebot]

✅ Testkube GitHub Integration

Review based on commit e696664.

All tests and quality gates passed.

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Phase	Status
Test Workflow Execution	✅ Passed
Quality Gate	✅ Passed

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7 workflows executed

✅ lint-go passed in 9m9s
_{🚀 29. Sep. 2026 - 13:19:53 UTC / 🏁 29. Sep. 2026 - 13:29:02 UTC}

✅ lint-proto passed in 39s
_{🚀 29. Sep. 2026 - 13:19:53 UTC / 🏁 29. Sep. 2026 - 13:20:33 UTC}

✅ integration-tests passed in 10m5s
_{🚀 29. Sep. 2026 - 13:19:53 UTC / 🏁 29. Sep. 2026 - 13:29:59 UTC}

✅ unit-tests passed in 10m12s
_{🚀 29. Sep. 2026 - 13:19:53 UTC / 🏁 29. Sep. 2026 - 13:30:06 UTC}

✅ verify-crds passed in 4m3s
_{🚀 29. Sep. 2026 - 13:19:53 UTC / 🏁 29. Sep. 2026 - 13:23:57 UTC}

✅ verify-protobuf passed in 35s
_{🚀 29. Sep. 2026 - 13:19:53 UTC / 🏁 29. Sep. 2026 - 13:20:29 UTC}

✅ lint-pr passed in 28s
_{🚀 29. Sep. 2026 - 13:19:53 UTC / 🏁 29. Sep. 2026 - 13:20:22 UTC}

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Manage this Integration

[vsukhin]

@greptile

[greptile-apps]

Confidence Score: 4/5

[Medium risk] Adds formatters for board and report data display.

The PR should not merge until an edit cannot leave a time-series report unrenderable.

Summary

This PR adds compact board and rendered-report formatters. The changes since the previous review separate validation of existing reports from creation defaults and tighten label-filter validation.

• A time-series report edit can now store an empty measure, leaving that report unrenderable.

_{Reviews (2) · Last reviewed commit: "feat(mcp): add formatters for boards and..."}