refactor(runtime): name all silent catch causes without changing diagnostics (#637)

* refactor(domain): split error taxonomy into thematic modules

Move each error family out of domain/errors.ts into its own module
(base, core, provider selection/adapter, browser observation,
artifact, evidence, unknown registry, hopper, configuration) and
relocate AnalysisErrorProjection to analysisErrorProjection.
Migrate all 162 importers to the owning modules and delete
errors.ts. No re-export shims; behavior is unchanged.

* refactor(runtime): name all silent catch causes without changing diagnostics

Bind cause in every bare catch and unhandled rejection across src/.
Real failures preserve the cause for logging; best-effort cleanup
carries an explicit comment. Caller-visible and Evidence strings are
byte-identical to before.

src/application/JavaScriptArtifactFiles.ts

@@ -232,7 +232,9 @@ const readText = async (
       included: true,
       value: new TextDecoder("utf-8", { fatal: true }).decode(bytes),
     };
-  } catch {
+  } catch (cause: unknown) {
+    // Non-UTF8 bytes are counted; the fixed reason preserves the schema.
+    void cause;
     context.invalidUtf8 += 1;
     return { included: false, reason: "invalid-utf8" };
   }