v1.0.1

Bug fixes from API testing — all 35 tools now verified working.

• Fix tt_reopen_project (POST → PUT)
• Fix tt_export_time_entries (handle CSV responses)
• Fix tt_get_project_times (correct request body format)
• Fix tt_add_time_entry (start and end now required)
• Fix tt_update_customer (name now required)
• Fix tt_mark_billed / tt_mark_not_billed (correct data format)
• Add GitHub Actions trusted publishing