refactor(runtime): centralize safe JSON parsing and preserve error causes (#629)

* refactor(domain): consolidate canonical ordering and digest helpers (#624)

* refactor(domain): consolidate canonical ordering and digest helpers

Single owner for code-point ordering (domain/canonicalOrdering.ts)
and canonical JSON digests (domain/comparisonSemantics.ts). Delete
all local compareCodePoints/compareText/digestCanonical duplicates
and migrate every importer. No re-export shims.

* fix(ci): allow slower real browser startup

* chore(config): remove dead eslint, dedupe scripts, cacheable turbo tasks

Delete eslint.config.js (oxlint is the linter), drop lint:dead alias,
pin smol-toml, fold jscpd/scan:todos into check:pr, make test:run
cacheable, align oxlint ignores.

* fix(config): hash all test inputs for cached runs

* docs: fix architecture diagram and pretty-print tool catalog

Drop dangling REPLAY edges, add dotnet/reference/error/evaluation
nodes. Emit 2-space JSON from the catalog generator and regenerate.

* test: extract shared fixtures, drop knip carve-outs

Dedupe android/apple session tests, bundler adapter headers, and
reconstruction helpers into tests/support fixtures. Delete unused
type aliases and the knip ignoreIssues block. Lower jscpd threshold
2.7 to 2.5.

* refactor(app): split Setup and ProcessOwnership modules

Extract SetupTypes/SetupHost from Setup.ts and move observation
helpers into ProcessOwnershipObservation/ProcessTree. Migrate all
importers including CLI commands. No re-export shims.

* refactor(runtime): centralize safe JSON parsing and preserve error causes

Add domain/safeJson.safeParseJson and migrate all raw JSON.parse
call sites. Name catch causes and preserve failure reasons instead
of swallowing; annotate genuine best-effort cleanup.

* fix(runtime): retain JSON parse error causes

src/reference/ReferenceSourceReaderFile.ts

@@ -220,6 +220,7 @@ export const readStableFile = async (
     if (message === undefined) throw cause;
     return entryFailure(path, "file", "io", message, safeSize(expected.size));
   } finally {
+    // best-effort cleanup: file-handle close must not mask the read result.
     await handle?.close().catch(() => undefined);
   }
 };