v0.8.2: cleanup + prose + structure + decomposition + budget + errors

Phase 1 — dedup + hardening (~9 items):
- Remove duplicate *skill-registry* defvar from core-skills
- Merge *backend-registry* into *probabilistic-backends*, delete backend-register
- Remove inject-stimulus alias, standardize on stimulus-inject
- Add pre-eval sandbox (skill-source-scan) blocks restricted symbols before eval
- Remove dead plist-get function; remove duplicate json-alist-to-plist export
- Fix read-framed-message whitespace DoS (4096-iteration max)
- Add *read-eval* nil to dispatcher-approvals-process read-from-string (RCE)
- Add test-op to ASDF; update .asd version 0.4.3→0.7.2

Phase 2 — prose + contracts + reorder:
- Split ROADMAP: 2623→1089 lines (TODO only), CHANGELOG: 260→1528 lines (full DONE history, 14 versions reverse chron)
- Add Contracts + Overview to 6 channel files + embedding-native + programming-standards + symbolic-scope
- Reorder 28 .org files: Contract → Test Suite → Implementation (TDD order)
- Add 7-phase inline prose to think() in core-reason
- Expand USER_MANUAL: 183→461 lines (10 new sections)

Phase 3 — decomposition + export organization:
- Decompose think() into think-assemble-prompt, think-call-llm, think-parse-response orchestrator
- Organize 188 exports into 16 grouped sections by module

Phase 4 — budget enforcement + error protocol:
- Per-session budget enforcement (SESSION_BUDGET_USD env var, budget-exhausted-p, guard in think-call-llm)
- Error condition hierarchy (6 conditions: pipeline-error, llm-error, gate-error, budget-error, protocol-error)
- Restarts in loop-process: skip-signal, use-fallback, abort-pipeline

org/channel-shell.org

@@ -26,6 +26,41 @@ Because shell execution is the highest-risk operation in the system, the Shell A
    command through the sandbox. When ~bwrap~ is unavailable, falls back to the
    existing ~timeout bash -c~ behavior.
 
+* Test Suite
+#+begin_src lisp
+(eval-when (:compile-toplevel :load-toplevel :execute)
+  (ql:quickload :fiveam :silent t))
+
+(defpackage :passepartout-shell-actuator-tests
+  (:use :cl :fiveam :passepartout)
+  (:export #:shell-actuator-suite))
+
+(in-package :passepartout-shell-actuator-tests)
+
+(def-suite shell-actuator-suite :description "Verification of the Shell Actuator")
+(in-suite shell-actuator-suite)
+
+(test test-bwrap-wrap-command
+  "Contract 2: bwrap-wrap-command returns properly formatted command list."
+  (let ((cmdline (passepartout::bwrap-wrap-command "echo hello" 30 "/home/user/memex")))
+    (is (member "bwrap" cmdline :test #'string=))
+    (is (member "--unshare-net" cmdline :test #'string=))
+    (is (member "--unshare-ipc" cmdline :test #'string=))
+    (is (member "echo hello" cmdline :test #'string=))))
+
+(test test-bwrap-available-p-returns-boolean
+  "Contract 1: bwrap-available-p returns T or NIL."
+  (let ((avail (passepartout::bwrap-available-p)))
+    (is (typep avail 'boolean))))
+
+(test test-actuator-shell-execute-echo
+  "Contract 3: actuator-shell-execute runs echo and returns output."
+  (let* ((action '(:type :REQUEST :target :shell :payload (:cmd "echo hello")))
+         (result (passepartout::actuator-shell-execute action nil)))
+    (is (stringp result))
+    (is (search "hello" result :test #'char-equal))))
+#+end_src
+
 * Implementation
 
 ** Shell Execution (actuator-shell-execute)
@@ -99,37 +134,3 @@ When bwrap is available, wraps the command in a Linux namespace sandbox."
   :trigger (lambda (ctx) (declare (ignore ctx)) nil))
 #+end_src
 
-* Test Suite
-#+begin_src lisp
-(eval-when (:compile-toplevel :load-toplevel :execute)
-  (ql:quickload :fiveam :silent t))
-
-(defpackage :passepartout-shell-actuator-tests
-  (:use :cl :fiveam :passepartout)
-  (:export #:shell-actuator-suite))
-
-(in-package :passepartout-shell-actuator-tests)
-
-(def-suite shell-actuator-suite :description "Verification of the Shell Actuator")
-(in-suite shell-actuator-suite)
-
-(test test-bwrap-wrap-command
-  "Contract 2: bwrap-wrap-command returns properly formatted command list."
-  (let ((cmdline (passepartout::bwrap-wrap-command "echo hello" 30 "/home/user/memex")))
-    (is (member "bwrap" cmdline :test #'string=))
-    (is (member "--unshare-net" cmdline :test #'string=))
-    (is (member "--unshare-ipc" cmdline :test #'string=))
-    (is (member "echo hello" cmdline :test #'string=))))
-
-(test test-bwrap-available-p-returns-boolean
-  "Contract 1: bwrap-available-p returns T or NIL."
-  (let ((avail (passepartout::bwrap-available-p)))
-    (is (typep avail 'boolean))))
-
-(test test-actuator-shell-execute-echo
-  "Contract 3: actuator-shell-execute runs echo and returns output."
-  (let* ((action '(:type :REQUEST :target :shell :payload (:cmd "echo hello")))
-         (result (passepartout::actuator-shell-execute action nil)))
-    (is (stringp result))
-    (is (search "hello" result :test #'char-equal))))
-#+end_src