Switch created-* filters to human-readable timestamps

[stympy]

This aligns timestamp handling with honeybadger-mcp-server and handles the changes in honeybadger-io/api-go#6.

Summary

• Update deployments list, uptime outages, and uptime checks to accept human-readable --created-after/--created-before values (YYYY-MM-DD or RFC3339).
• Add shared time parsing/validation helper and return clear errors for invalid timestamp input.
• Add/expand tests to verify date-string parsing is converted to Unix epoch query params and that empty timestamp filters are omitted.

Breaking change

• Unix epoch values are no longer accepted for --created-after / --created-before on these commands.

[Copilot]

Pull request overview

This pull request switches timestamp filter flags from Unix epoch values to human-readable date strings, aligning with the honeybadger-mcp-server conventions. It updates the deployments list, uptime outages, and uptime checks commands to accept --created-after and --created-before flags in YYYY-MM-DD or RFC3339 format. A new shared helper function parseTimeFlag provides consistent time parsing with clear error messages across all affected commands.

Changes:

• Replaced Unix epoch (int64) timestamp flags with human-readable string timestamps for created-after/created-before filters
• Added parseTimeFlag helper function supporting RFC3339, date-only (YYYY-MM-DD), and datetime without zone formats
• Updated api-go dependency to v0.4.1-0.20260218211314-b4dfa5f13e9b to support time.Time instead of int64 for timestamp filters

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
go.mod	Updated api-go dependency to pre-release version supporting time.Time timestamp filters
go.sum	Added checksums for new api-go dependency version
cmd/root.go	Added parseTimeFlag helper function for parsing user-provided timestamps in multiple formats
cmd/deployments.go	Changed created-after/created-before flags from int64 to string, added parsing logic
cmd/uptime.go	Changed created-after/created-before flags from int64 to string for both outages and checks commands
cmd/dataapi_test.go	Added integration tests verifying timestamp conversion and empty timestamp handling for deployments
cmd/uptime_test.go	Added integration tests verifying timestamp conversion and empty timestamp handling for outages and checks
CHANGELOG.md	Documented breaking change for timestamp flag format requirements

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