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/architect.md

@@ -326,15 +326,15 @@ result, a concrete use case to arrive.
 
 A decision should be `deferred(scope)` when:
 
-- The use case isn't concrete (e.g., "we don't know what the agent crate
-  will need from the call protocol")
+- The use case isn't concrete (e.g., "we don't know if any consumer needs
+  arrays of variable-length-element structs")
 - The options depend on something that doesn't exist yet (e.g.,
-  "depends on the alknet-http crate spec")
+  "depends on a concrete consumer schema that needs this feature")
 - The trade-off requires data that can only come from implementation
   (e.g., "need performance benchmarks to choose between X and Y")
 - The decision is genuinely not needed for the current scope (e.g., "the
-  current scope is core + call crates; this question is about the agent
-  crate")
+  current scope is the core engine; this question is about a builder API
+  that no current consumer needs")
 
 ### `deferred(unclear)` — the pieces exist but the shape isn't clear
 
@@ -373,10 +373,10 @@ A decision should be `deferred(unclear)` when:
    (implies it's decided).
 2. **State the blocking condition** (`deferred(scope)`) or
    **investigation target** (`deferred(unclear)`) — what specific thing
-   would unblock this? Be concrete: "blocked on: alknet-agent crate spec
-   exists" or "investigation: work through 2+ example outbound-dial use
-   cases (hub→worker, worker→hub) to see how verifier-selection +
-   provider + connector compose."
+   would unblock this? Be concrete: "blocked on: a concrete consumer that
+   needs arrays of variable-length-element structs" or "investigation:
+   work through 2+ example schemas with nested variable-length arrays to
+   see how the lazy walking logic would compose."
 3. **State the impacts** — what does this block downstream? Be
    specific: "blocks the first hub deployment because the hub dials
    workers" not "blocks the hub crate." This is the triage signal that