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Integrates the **tourist** trace analysis library and builds a full `zen trace` command suite for working with Unreal Engine `.utrace` files.
### Trace analysis library (`thirdparty/tourist/`)
- Adds the tourist library as a third-party dependency with three modules: **foundation** (platform primitives, memory, scheduling), **trace** (UE Trace protocol decoding), and **analysis** (event dispatching and analyzer framework).
- Cross-platform support for Windows, Linux, and macOS.
### `zen trace` CLI commands (`src/zen/cmds/`, `src/zen/trace/`)
- **`zen trace analyze`** — Summarize a `.utrace` file: session metadata, thread inventory, command line + build configuration, CPU profiling scopes, timing, event rates, log messages, and (with symbols) memory allocation metrics including live-allocs dumps, callstack-keyed aggregation, and allocation churn. Optional HTML output for memory reports.
- **`zen trace inspect`** — Dump the event schema (declared types, fields, sizes) from a trace file.
- **`zen trace trim`** — Extract a time-window from a trace into a new `.utrace` file.
- **`zen trace serve`** — Launch a local HTTP server hosting an interactive trace viewer; opens in the default browser.
### Symbolication (`src/zen/trace/symbol_resolver.*`, `thirdparty/raw_pdb/`)
- Pluggable resolver with multiple backends: `pdb` (in-tree raw_pdb), `dbghelp` (Windows), `llvm-symbolizer` (all platforms), `atos` (macOS). An `auto` backend picks the best available tool per platform.
- Microsoft Symbol Server support: downloads PDBs on demand using a redirect-aware HTTP client.
- Local PDB cache keyed by image GUID preserves symbols across binary recompilation.
- Callstack trimming heuristic strips UE internal noise from reports.
- Binary analysis cache (`.ucache_z`) avoids re-resolving the same trace.
### Interactive trace viewer (`src/zen/frontend/html/`, `src/zen/trace/trace_viewer_service.*`)
- Timeline: scope-level detail, horizontal zoom/pan, vertical scrolling, viewport-driven loading with pre-computed LOD for responsive navigation of large traces.
- Thread grouping (collapsible sidebar sections) synthesized from name suffixes, natural sort order, visual distinction between lane threads and OS threads.
- Bookmark and region annotations; region categories with per-category toggles; bookmark marker toggle in the toolbar.
- Filterable Logs tab showing captured `UE_LOG` output.
- Stats tab with per-scope aggregate statistics.
- Memory tab with interactive allocation analysis and an allocation size histogram.
- CsvProfiler event parsing and chart UI.
### Other in-branch supporting changes
- **Cross-platform browser launcher** (`browser_launcher.{h,cpp}`) used by `trace serve`.
- **`ReciprocalU64`** fast 64-bit integer division (zencore/intmath) for trace analyzers.
- **`parallelsort`** cross-platform parallel sort helper (zenutil).
- Frontend zip build rule so the viewer's HTML assets are bundled into `zen.exe`.
- `/Zo` flag for better optimized debug info on Windows release builds.
- `trace-tests.cpp` in the `zen-test` harness (harness itself landed on main via #985).
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string literals in zen.cpp (#776)
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- Improvement: Use consistent language for command line argument parsing errors
- Improvement: Changed zen command parsing errors to output help first and error last to make it easier to spot the error
- Improvement: Refactor zen command return codes to conform to valid Linux range (0-255)
kSuccess = 0,
kOtherError = 1,
kBadInput = 2,
kOutOfMemory = 16,
kOutOfDisk = 17,
kAssertError = 70,
kHttpOtherClientError = 80,
kHttpCantConnectError = 81,
kHttpNotFound = 66, // NotFound(404)
kHttpUnauthorized = 77, // Unauthorized(401),
kHttpSLLError = 82,
kHttpForbidden = 83, // Forbidden(403)
kHttpTimeout = 84, // RequestTimeout(408)
kHttpConflict = 85, // Conflict(409)
kHttpNoHost = 86,
kHttpOtherServerError = 90,
kHttpInternalServerError = 91, // InternalServerError(500)
kHttpServiceUnavailable = 69, // ServiceUnavailable(503)
kHttpBadGateway = 92, // BadGateway(502)
kHttpGatewayTimeout = 93, // GatewayTimeout(504)
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* zen.exe commands: Add initializers for all POD types; this fixes incorrect behavior for flags in debug
* README.md: Fix typo in --no-dry-run line
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* move commands in scrub.h/cpp to admin_cmd.h/cpp
* move job command into admin_cmd.h/.cpp
* admin -> admin_cmd
* bench -> bench_cmd
* cache -> cache_cmd
* copy -> copy_cmd
* dedup -> dedup_cmd
* hash -> hash_cmd
* print -> print_cmd
* projectstore -> projectstore_cmd
* rpcreplay -> rpcreplay_cmd
* serve -> serve_cmd
* status -> status_cmd
* top -> top_cmd
* trace -> trace_cmd
* up -> up_cmd
* version -> version_cmd
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