fix build/distribution spec: npm deps not workspace, align configs with sibling projects, resolve review issues

- Replace workspace:* deps with published npm semver ranges (^0.34.49, ^0.1.0)
- Expand package.json: add description, publishConfig, scripts, engines,
  devDependencies, conditional exports with types/default for import+require
- Fix tsup entry names (path-prefixed like ujsx), add target: es2022,
  remove splitting:true (not used by sibling projects)
- Align tsconfig with sibling projects: add lib, noUncheckedIndexedAccess,
  noUnusedLocals, noUnusedParameters, erasableSyntaxOnly, etc.
- Expand vitest.config.ts with include, coverage, and path alias
- Clarify @preact/signals-core as direct dep (not just transitive via ujsx)
- Clarify @alkdev/pubsub is a consumer dependency, not flowgraph's dep
- Fix edge key convention: document composite key format for call graph's
  multi-edge-type scenario (triggered + depends_on between same pair)
- Align OperationEdgeAttrs field naming: use detail+mismatches consistently
  instead of compatibilityDetail
- Add InvalidInputError to error hierarchy (referenced in flowgraph-api but
  was missing)
- Fix undefined attrs.category reference in reactive-execution.md
- Remove internal drafting note from host-configs.md
- Fix ReactiveHostConfig constructor signature inconsistency across docs
- Constrain TemplateEdgeAttrs.edgeType to sequential|conditional only

docs/architecture/operation-graph.md

@@ -54,7 +54,7 @@ Round-trip: `fromSpecs()` → `export()` → `fromJSON()` is lossless.
 ```typescript
 const graph = new FlowGraph();
 graph.addOperation(spec);
-graph.addTypedEdge("task.classify", "task.enrich", { compatible: true, detail: "output → input" });
+graph.addTypedEdge("task.classify", "task.enrich", { compatible: true, detail: "output → input", mismatches: [] });
 ```
 
 `addOperation` adds a node. `addTypedEdge` adds a type-compatibility edge. Both throw on duplicates (matching taskgraph's behavior).