🤖 Repo Assist — addressing a long-standing usability issue with delayed/lazy series display.

Summary

When a delayed (lazy) series was printed (in FSI, ToString(), or Format()), it showed the opaque string (Suppressed), which gave users no useful information about the series they had just created.

Before:

series [ (Suppressed)]
```
**After:**
```
series [ (Delayed series [2000-01-01 .. 2023-12-31])]

Root Cause

DelayedVector.SuppressPrinting returns true to prevent data loading during printing. The printing code in Series.fs branched on this flag but simply showed "(Suppressed)". However, the key range is already available in DelayedIndex.KeyRange which returns (source.RangeMin, source.RangeMax) — both set at construction time, with no data loading required.

Fix

In Series.ToString() and Series.FormatStrings(), when vector.SuppressPrinting is true, access series.KeyRange to get the [lo .. hi] bounds and format a descriptive message. A try/with guard preserves backward compatibility for any edge case.

Changes

• src/Deedle/Series.fs: two one-line-to-four-line improvements in ToString() and FormatStrings()

Test Status

✅ Build succeeded
✅ All 670 tests pass (dotnet test tests/Deedle.Tests/Deedle.Tests.fsproj -c Release)

The existing test suite does not include a test for delayed-series printing. Adding one would require the DelayedSeries test infra; maintainers may wish to add a unit test for this if they consider it important.

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