zen history command (#987)

- 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)

1 files changed, 50 insertions, 0 deletions

diff --git a/src/zencore/process.cpp b/src/zencore/process.cpp
index 4708f15cf..5d37c3715 100644
--- a/src/zencore/process.cpp
+++ b/src/zencore/process.cpp
@@ -906,6 +906,56 @@ BuildArgV(std::vector<char*>& Out, char* CommandLine)
 
 #endif	// !WINDOWS || TESTS
 
+std::string
+GetRawCommandLine()
+{
+#if ZEN_PLATFORM_WINDOWS
+	LPWSTR Raw = ::GetCommandLineW();
+	if (Raw == nullptr)
+	{
+		return {};
+	}
+	return WideToUtf8(Raw);
+#else
+	return {};
+#endif
+}
+
+std::string
+BuildCommandLine(std::span<const std::string> Argv)
+{
+	constexpr AsciiSet QuoteChars = " \t\"";
+
+	std::string Result;
+	for (size_t I = 0; I < Argv.size(); ++I)
+	{
+		if (I > 0)
+		{
+			Result += ' ';
+		}
+
+		const std::string& Arg		   = Argv[I];
+		const bool		   NeedsQuotes = Arg.empty() || AsciiSet::HasAny(Arg.c_str(), QuoteChars);
+		if (!NeedsQuotes)
+		{
+			Result += Arg;
+			continue;
+		}
+
+		Result += '"';
+		for (char Ch : Arg)
+		{
+			if (Ch == '"')
+			{
+				Result += '\\';
+			}
+			Result += Ch;
+		}
+		Result += '"';
+	}
+	return Result;
+}
+
 #if ZEN_PLATFORM_WINDOWS
 static CreateProcResult
 CreateProcNormal(const std::filesystem::path& Executable, std::string_view CommandLine, const CreateProcOptions& Options)