Fix all-day calendar event edits

[robzolkos]

Summary

• bump github.com/basecamp/hey-sdk/go to v0.28.1
• verify all-day event edits omit both clock-time fields
• sync the vendored SDK model provenance with the pinned release

Fixes #362.

Validation

• Confirmed the new regression test fails against SDK v0.28.0 with starts_at_time=:00 and ends_at_time=:00
• Confirmed the test passes against SDK v0.28.1
• GOWORK=off make check
• Live HEY smoke test with this branch: create all-day event, edit its title, and delete it successfully

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Summary by cubic

Fixes all-day calendar event edits by upgrading @basecamp/hey-sdk/go to v0.28.1, which stops the edit request from sending the starts_at_time and ends_at_time fields as :00 for all-day events. Adds a regression test that verifies those fields are omitted.

• Bumps github.com/basecamp/hey-sdk/go from v0.28.0 to v0.28.1 and syncs the vendored SDK model provenance and Nix vendor hash.
• Adds a test confirming all-day event edits send calendar dates without clock times.

^{Written for commit 214f8e2. Summary will update on new commits.}

[Copilot]

Pull request overview

Pins the HEY SDK release that fixes all-day event updates and adds regression coverage for omitted clock-time fields.

Changes:

• Upgrades hey-sdk/go to v0.28.1.
• Tests all-day event edit payloads.
• Synchronizes MCP model provenance.

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Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
go.mod	Pins HEY SDK v0.28.1.
go.sum	Updates SDK checksums.
internal/cmd/events_test.go	Adds all-day edit regression coverage.
internal/mcpserver/model/PROVENANCE.json	Records the matching SDK tag and commit.

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