feat: SG-42630: Add crash-dump reporting capability to RV

[bernie-laberge]

Linked issues

Fixes #1268

Summarize your change.

Adds minidump-based crash reporting to RV on macOS, Linux, and Windows, using Google Crashpad
for in-process capture (plus the out-of-process crashpad_handler) and Google Breakpad for
offline symbolication tooling (dump_syms, minidump_stackwalk, minidump_dump). The two libraries
are kept strictly disjoint. The intended architecture and its invariants are documented normatively in
docs/crash-reporting.md.

Describe the reason for the change.

RV had no way to capture actionable crash reports from end users. This adds automatic minidump capture
with enough context — which Mu/Python script was executing, GPU info, and the attached session log —
to symbolicate and debug a crash offline, without needing a reproduction.

Describe what you have tested and on which operating system.

• macOS (Apple Silicon) — full local validation: handler init across rv/RV/rvio; a triggered
  crash() produces a minidump with the expected annotations (platform, gpu_*, py_*,
  mu_function); symbols are stripped from the Release install; the symbols_archive zip is produced;
  a real dump symbolicates end-to-end via symbolicate_crash.sh; the unit + smoke tests pass under
  ctest.
• Windows (VS 2022, Release) — validated: the Release install strips all PDBs; symbols_archive
  produces RV-<version>-windows-amd64-symbols.zip containing the PDBs; CrashHandlerTest builds and
  passes.
• Linux (Rocky) — the implementation carries Linux-specific support (the crashpad_handler
  wrapper with the ulimit -t guard, .sym generation, install rules); the unit + smoke tests run in
  CI on Linux.

Add a list of changes, and note any that might need special attention during the review.

Crash capture

• src/lib/base/TwkUtil/CrashHandler.{h,cpp} — singleton Crashpad handler: annotation table, log
  attachment, init-order-independent pre-init annotation buffering.
• src/lib/app/MuTwkApp/CrashHandlerInit.{h,cpp} — one shared init path for rv, the macOS RV
  bundle, and rvio; per-platform handler wrappers (src/bin/apps/rv/crashpad_handler_*.sh.in).

Script context — ⚠️ please review the Mu-core touch points

• src/lib/mu/Mu/Mu/ExecutionObserver.h + hooks in MachineRep.cpp / Thread.cpp: a
  dependency-free execution-observer hook in the Mu core (no TwkUtil/Qt dependency); the
  crash-specific MuCrashObserver lives in the app layer (src/lib/app/MuTwkApp). Function-level
  fidelity. The crash() Mu command (IPMu/CommandsModule.cpp) is a test-only trigger and carries
  no production logic.

Symbols & packaging — ⚠️ note the OpenRV ↔ pipeline boundary

• cmake/macros/rv_generate_symbols.cmake — build-time .sym (and native PDBs on Windows); the
  intermediate .dSYM is removed after generation so it does not pollute the staged plugin dirs.
• cmake/macros/rv_archive_symbols.cmake (+ rv_collect_pdbs.cmake) — the symbols_archive target
  builds a versioned, per-platform symbol zip. OpenRV only produces the archive; uploading it to a
  symbol store is left to the external build/release pipeline (no external infrastructure assumed).
• cmake/install/pre_install*.cmake — strip symbols from the customer (Release) package.
• src/bin/apps/rv/symbolicate_crash.sh — portable; adds a --symbols <dir> override.

Tests — ⚠️ enabled by default in CI

• src/test/CrashHandlerTest (doctest unit) and src/test/CrashDumpSmokeTest (end-to-end). The smoke
  test launches RV with crash() and asserts a dump is produced (annotations too where minidump_dump
  is available); reviewers may want to confirm the headless launch behaves on their CI runners.

Docs

• docs/crash-reporting.md (normative/technical spec).
• docs/rv-manuals/rv-crash-reporting.md — user-facing guide added to the docs site: how crash reporting works, where dumps are written per platform, and how to disable it (RV_CRASH_DUMPS_ENABLED=0).

If possible, provide screenshots.

N/A — this is a build/runtime backend feature with no UI.

When launching RV, the crash dumps directory is shown:

rel (run rvcfg/rvmk) labergb@MTLGJKW517F71 MacOS % ./rv
INFO: real-time thread priorities set (bus=100000kHz)
./rv
Version 4.0.0 (RELEASE), built on Jun 19 2026 at 10:52:14 (HEAD=c5a74aaf).
Copyright Contributors to the Open RV Project
INFO: Crash handler initialized successfully
INFO: Crash dumps will be saved to: /Users/labergb/Library/Logs/ASWF/Crashes/

Symbolicating a crash report:

% ./symbolicate_crash.sh /Users/labergb/Library/Logs/ASWF/Crashes/pending/4b94d812-9292-4d51-a19d-093c0954560b.dmp 
Symbolicating crash dump...

Example of a symbolicated crash

Operating system: Mac OS X
                  26.5.1 25F80
CPU: arm64
     10 CPUs

GPU: Apple Apple M1 Pro

Crash reason:  EXC_BAD_ACCESS / KERN_INVALID_ADDRESS
Crash address: 0x0
Process uptime: 28 seconds

Thread 0 (crashed)
 0  rv!IPMu::crash(Mu::Node const&, Mu::Thread&) + 0x8
     x0 = 0x0000000116704508    x1 = 0x0000000114cbce00
     x2 = 0x0000000114cbce00    x3 = 0x0000000130e5ed11
     x4 = 0x0000000000000000    x5 = 0x0000000000000000
     x6 = 0x0000000000000000    x7 = 0xfffff0003ffff800
...

========================================
Crashpad Annotations
========================================

gpu_renderer: Apple M1 Pro
gpu_vendor: Apple
python_caller: 
py_function: _update_media_info
py_script_line: 446
py_script_file: /Users/labergb/openrv_bernie2/OpenRV/_build/stage/app/RV.app/Contents/PlugIns/Python/multiple_source_media_rep.py
mu_script_file: 
mu_function: rvui.clearEverything