[Repo Assist] Release 8.0.0-alpha-008

[github-actions]

🤖 This is an automated PR from Repo Assist.

Summary

Proposes a new 8.0.0-alpha-008 release. The [Unreleased] section has accumulated 5 items since alpha-007 (2026-03-10):

Added

• Support for #elif preprocessor directive. #3268

Fixed

• Multiline val body in signature files was not indented correctly. #3269
• /// doc comment without associated declaration (e.g. at end of file) was duplicated when formatting. #2499
• NamedIndexedPropertySet with two SynLongIdent removed space. #3273
• %% (double-percent) infix operator moved to new line, producing invalid F#. #2107
• Indentation warning when formatting match with long anonymous record discriminant. #1903

Change

Adds ## [8.0.0-alpha-008] - 2026-03-20 heading to CHANGELOG.md and leaves ## [Unreleased] empty for future entries.

Rationale

10 days have passed since the last alpha release, and the unreleased section contains a meaningful set of additions and fixes. Releasing alpha-008 makes these available to early adopters and keeps the alpha track progressing.

Test Status

This PR only modifies CHANGELOG.md — no source code changes. All CI checks are expected to pass as-is.

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[nojaf]

Will do this another time.