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Robustness: VectorCraft never crashes — no panics in shipped code

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Shipped code no longer unwraps, expects or panics: every one of the 124
unwrap()/expect()/panic!/unreachable! sites outside tests now handles the
failure (Result/Option, ?, let-else, defaults) and reports errors to the user.

- Lints: workspace clippy denies unwrap_used, expect_used, panic, todo,
  unimplemented and unreachable; clippy.toml allows them in tests, and
  integration tests, examples and testkit opt out explicitly.
- Safety net (vectorcraft_engine::guard): a panic in a top-level command rolls
  the document back and returns EngineError::Internal; a panicking tool is
  reset; the MCP server answers with an internal error and keeps serving; the
  UI frame and each control request are guarded.
- APIs that hid failures now return them: Rendered::to_png/to_jpeg/to_webp
  return Result (JPEG/WebP errors used to write empty files),
  FontDb::face returns Option, Region::top returns Option.
- Fuzzing: engine/tests/import_fuzz.rs feeds garbage, hostile and mutated SVG
  and PDF through import → render → export (30k cases locally, no panics).
- Docs: AGENTS.md/CLAUDE.md rule, docs/development.md "Robustness" section,
  README pointer and a PR template checklist.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Brandon Thomas
2026-10-05 06:28:59 +07:00
committed by bflatastic
co-authored by Claude Opus 5.5
parent 0f241aac9f
commit 3e323bfa2a
89 changed files with 1041 additions and 303 deletions
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README.md
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@@ -173,8 +173,9 @@ milestones, and honest time-to-parity estimates.
and `apps/{vectorcraft, vectorcraft-cli, vectorcraft-web}`. The egui frontend is its own crate, so
the UI can be swapped without touching the engine.
Agent and contributor rules (clean-room, the asset policy, quality gates) are in
[`AGENTS.md`](AGENTS.md). Every bundled asset is listed with its licence in [`ASSETS.md`](ASSETS.md).
Agent and contributor rules (clean-room, the asset policy, no panics in shipped code, quality gates) are in
[`AGENTS.md`](AGENTS.md); [`docs/development.md`](docs/development.md#robustness-vectorcraft-never-crashes)
explains how VectorCraft avoids crashing. Every bundled asset is listed with its licence in [`ASSETS.md`](ASSETS.md).
## The Crafting Apps