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

.opencode/agents/code-reviewer.md

@@ -111,13 +111,13 @@ cargo fmt --check                                              # Format check
 For this project, also verify:
 
 - No comments in code (per project convention)
-- Error handling uses `anyhow::Result` (application) / `thiserror` (library) — no
-  panics in library code
-- Feature flags are used correctly (`tls`, `iroh`, `acme`) — base crate compiles
-  lean
+- Error handling uses `AlkTypeError` (hand-rolled enum in `src/error.rs`) — no
+  panics in library code, no `anyhow`/`thiserror`
+- No feature flags (the crate has none) — only `serde_json` + `jsonschema` deps
 - Public API is well-documented with `///` doc comments where appropriate
-- Module structure follows Rust conventions (`mod.rs`, `lib.rs`)
+- Module structure follows Rust conventions (`lib.rs`)
 - No unnecessary `unwrap()` or `expect()` in library code
+- WASM-clean: no platform deps, no tokio, no async
 
 #### E. Security