| Commit message (Collapse) | Author | Age | Files | Lines |
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- `GetEnvVariable` now returns `std::optional<std::string>` so callers can distinguish an unset variable from one set to an empty value.
- Windows path uses `SetLastError(ERROR_SUCCESS)` + `ERROR_ENVVAR_NOT_FOUND` to detect "not found"; POSIX path returns `nullopt` when `getenv` returns `nullptr`.
- All call sites migrated. Most use `.value_or("")` to preserve current empty-or-unset behavior. The diagnostic helpers in `zen-test/artifactprovider-tests.cpp` now report `<unset>` vs `<empty>` distinctly.
- Added a check in the `ExpandEnvironmentVariables` test confirming `nullopt` for an unset variable; PATH/HOME lookups in that test use `REQUIRE(has_value())` so a missing var fails cleanly instead of throwing `bad_optional_access`.
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* scrub sensitive command line options from log and sentry
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- Feature: Per-user invocation history for `zen` and `zenserver`; each startup appends a record to a JSONL file capped at the most recent 100 entries. Location: `%LOCALAPPDATA%\Epic\Zen\History\invocations.jsonl` on Windows, `~/.zen/History/invocations.jsonl` on POSIX
- `zen history` opens an interactive picker; selecting a zen row re-runs it inline and forwards the exit code, selecting a zenserver row spawns it detached
- `zen history --list` (`-l`) prints the table to stdout instead of showing the picker
- `zen history --filter zen|zenserver` restricts the listing to one executable
- `zen history --print` prints the reconstructed command line of the selected row instead of launching it
- `--enable-execution-history` global option on both binaries (default `true`) to opt out per invocation
- The history file is attached to Sentry crash reports (alongside the existing zenserver log)
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