v0.3.0 finish: TUI tests, embedding wiring, gateway :configured, focus commands, export cleanup

- TUI: Fix stale contract (remove handle-return/*incoming-msgs*), rewrite
  10->13 tests (38 checks, 100% pass). Export missing symbols from TUI
  package. Fix view-chat contract arity.
- Gateway messaging: Add :configured key to registry (boolean, nil default).
  Fix contract to match (vault-based, not env-var-based).
- Async Embedding Gateway: Add *embedding-backend* var, embeddings-compute
  function. Modify ingest-ast to populate vectors on new objects.
  Add EMBEDDING_PROVIDER env var support. Add Contract + 4 tests (8 checks).
- Context Manager: Add /focus, /scope, /unfocus commands to TUI on-key
  handler. Commands degrade gracefully when context-manager not loaded.
- Export hygiene: Remove 30+ ghost exports (undefined symbols). Remove
  duplicate/mismatched names. Exports now match actual definitions.

org/core-defpackage.org

@@ -30,15 +30,10 @@ The package definition. All public symbols are exported here.
    #:read-framed-message
     #:PROTO-GET
     #:proto-get
-   #:LIST-OBJECTS-WITH-ATTRIBUTE
-   #:COSINE-SIMILARITY
-   #:VAULT-MASK-STRING
    #:*VAULT-MEMORY*
-   #:parse-message
    #:make-hello-message
    #:validate-communication-protocol-schema
    #:start-daemon
-   #:stop-daemon
    #:log-message
    #:main
     #:diagnostics-run-all
@@ -48,17 +43,10 @@ The package definition. All public symbols are exported here.
     #:register-provider
     #:provider-openai-request
     #:provider-config
-    #:system-ready-p
    #:run-setup-wizard
-   #:skill-gateway-register
-   #:skill-gateway-link
-   #:gateway-manager-main
    #:ingest-ast
    #:memory-object-get
-   #:list-objects-by-type
-   #:org-id-new
    #:*memory-store*
-   #:*history-store*
    #:memory-object
    #:make-memory-object
    #:memory-object-id
@@ -74,14 +62,7 @@ The package definition. All public symbols are exported here.
    #:memory-object-scope
    #:snapshot-memory
    #:rollback-memory
-   #:context-query-store
-   #:context-get-active-projects
-   #:context-get-recent-completed-tasks
-   #:context-list-all-skills
-   #:context-get-skill-source
     #:context-get-system-logs
-    #:context-resolve-path
-    #:context-get-skill-telemetry
     #:telemetry-track
     #:context-assemble-global-awareness
     #:context-awareness-assemble
@@ -90,15 +71,12 @@ The package definition. All public symbols are exported here.
    #:loop-process
     #:perceive-gate
     #:loop-gate-perceive
-    #:probabilistic-gate
-    #:consensus-gate
     #:act-gate
     #:loop-gate-act
     #:reason-gate
     #:loop-gate-reason
     #:cognitive-verify
     #:backend-cascade-call
-    #:dispatch-gate
     #:register-pre-reason-handler
     #:inject-stimulus
     #:stimulus-inject
@@ -113,13 +91,10 @@ The package definition. All public symbols are exported here.
     #:dispatcher-gate
     #:wildcard-match
     #:actuator-initialize
-   #:dispatch-action
    #:action-dispatch
    #:register-actuator
    #:load-skill-from-org
     #:skill-initialize-all
-    #:load-skill-with-timeout
-    #:topological-sort-skills
     #:lisp-syntax-validate
     #:defskill
        #:*skill-registry*
@@ -130,6 +105,7 @@ The package definition. All public symbols are exported here.
        #:embed-queue-object
        #:embed-object
        #:embed-all-pending
+       #:embedding-backend-hashing
        #:embeddings-compute
      #:skill
    #:skill-name
@@ -140,12 +116,6 @@ The package definition. All public symbols are exported here.
    #:skill-deterministic-fn
    #:def-cognitive-tool
    #:*cognitive-tool-registry*
-   #:verify-git-clean-p
-   #:engineering-standards-verify-lisp
-   #:engineering-standards-format-lisp
-   #:literate-check-block-balance
-   #:check-tangle-sync
-   #:*tangle-targets*
     #:org-read-file
     #:org-write-file
     #:org-headline-add
@@ -155,11 +125,8 @@ The package definition. All public symbols are exported here.
     #:gateway-start
     #:org-property-set
     #:org-todo-set
-    #:org-find-headline-by-id
-    #:org-find-headline-by-title
     #:org-id-generate
     #:org-id-format
-    #:org-ast-to-org
     #:org-modify
     #:lisp-validate
     #:lisp-structural-check
@@ -169,13 +136,9 @@ The package definition. All public symbols are exported here.
     #:lisp-format
     #:lisp-list-definitions
     #:lisp-extract
-    #:lisp-structural-wrap
     #:lisp-inject
     #:lisp-slurp
-    #:lisp-register
    #:get-oc-config-dir
-   #:prompt-for
-   #:save-secret
     #:get-tool-permission
     #:set-tool-permission
     #:check-tool-permission-gate
@@ -187,13 +150,7 @@ The package definition. All public symbols are exported here.
    #:cognitive-tool-parameters
    #:cognitive-tool-guard
    #:cognitive-tool-body
-   #:*emacs-clients*
-   #:*clients-lock*
-   #:register-emacs-client
-   #:unregister-emacs-client
-   #:ask-probabilistic
    #:register-probabilistic-backend
-   #:distill-prompt
    #:*probabilistic-backends*
    #:*provider-cascade*
     #:vault-get
@@ -201,7 +158,6 @@ The package definition. All public symbols are exported here.
     #:vault-get-secret
     #:vault-set-secret
     #:memory-objects-by-attribute
-    #:find-headline-missing-id
     #:gateway-cli-input
     #:repl-eval
     #:repl-inspect
@@ -215,8 +171,7 @@ The package definition. All public symbols are exported here.
     #:gateway-registry-initialize
     #:messaging-link
     #:messaging-unlink
-    #:gateway-configured-p
-    #:dispatcher-flight-plan-create))
+    #:gateway-configured-p))
 #+end_src
 
 ** Package Implementation