Clean up rebranding drift in docs, agent configs, and source comments

Fix stale references left over from the alknet-typedef → alktype migration:
- .opencode/agents/: replace @alkdev/alknet constraints (tokio, crypto, feature
  flags, anyhow/thiserror) with alktype-accurate ones (sync, AlkTypeError,
  WASM-clean); fix @alkimiadev → @alkdev org name; remove nonexistent AGENTS.md
  ref; replace alknet-http/alknet-agent spec examples
- docs/sdd_process.md: fix wrong package name (@alkdev/storage → @alkdev/alktype)
- docs/architecture/: rewrite dangling /workspace/ and docs/research/ paths as
  @alkdev/alknet: cross-repo references with explanatory notes; fix
  @alkimiadev → @alkdev; fix 'not yet used by any alknet crate' stale context
- src/ + tests/: correct '17 AlkType kinds' → '19' in doc comments (enum has 19
  variants; pre-existing count error); fix dangling /workspace/ path in
  poc_roundtrip.rs

docs/architecture/schema-layer.md

@@ -13,7 +13,7 @@ annotations.
 ## The 19 AlkType Kinds
 
 These are the custom schema kinds defined in TypeBox's `typedef.ts`
-(`/workspace/@alkdev/typebox/example/typedef/typedef.ts`, 619 lines) and
+(`@alkdev/alknet: typebox/example/typedef/typedef.ts`, 619 lines) and
 ported to Rust via `jsonschema` custom keywords. Each kind carries binary
 layout semantics — a known byte size (for fixed-size types) or a known
 encoding strategy (for variable-length types).
@@ -296,7 +296,7 @@ let validator = jsonschema::options()
     .with_keyword("AlkType:Float32", factory)
     .with_keyword("AlkType:Int32", factory)
     .with_keyword("AlkType:Struct", factory)
-    // ... all 17 kinds
+    // ... all 19 kinds
     .build(&schema)?;
 ```
 
@@ -498,9 +498,10 @@ See [open-questions.md](open-questions.md) for full details.
 
 ## References
 
-- `/workspace/@alkdev/typebox/example/typedef/typedef.ts` — the TypeBox
+- `@alkdev/alknet: typebox/example/typedef/typedef.ts` — the TypeBox
   schema kinds (619 lines)
-- `/workspace/jsonschema/` — the jsonschema crate (v0.46.5, Draft 2020-12)
+- `@alkdev/alknet: jsonschema/` — the jsonschema crate (v0.46.5, Draft
+  2020-12)
 - [ADR-003](decisions/003-schema-annotations.md) — schema
   annotation shapes
 - [validation.md](validation.md) — custom keyword validator implementations