e42: enhanced (formatted) process programs S7F23-F26

E42 was an explicit out-of-scope item in the prior COMPLIANCE.md.
This commit closes it.

Wire messages added via the catalog:
  S7F23  Formatted PP Send       (H↔E, W=1)
  S7F24  Formatted PP Ack        (ProcessProgramAck)
  S7F25  Formatted PP Request    (PPID, W=1)
  S7F26  Formatted PP Data       (E→H, no reply)

Body shape: <L,4 PPID MDLN SOFTREV <L,n <L,2 CCODE <L,m <L,2
PNAME PVAL>>>>>.  PVAL is declared ITEM so any SECS-II Item type
round-trips — proven by a test that mixes ASCII, BOOLEAN, U4, F8,
Binary, and nested List values in one step.

RecipeStore extension:
  add_formatted(ppid, FormattedRecipe{mdln, softrev, steps})
  get_formatted(ppid) -> optional<FormattedRecipe>
  has_formatted(ppid) -> bool

Formatted + opaque views live alongside each other: a PPID can carry
both, size() counts unique PPIDs.  remove() kills both views.

Six new tests cover wire round-trip per function, every
ProcessProgramAck code, ITEM passthrough, and the store's dual-view
semantics.

COMPLIANCE.md updated: E30 §6.17 row mentions S7F23-F26, S5 message
table grows two rows, §8 "out of scope" entry for E42 removed.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

data/messages.yaml

@@ -1204,6 +1204,94 @@ messages:
     builder: s7f18_delete_pp_ack
     body: {kind: scalar, item_type: BINARY_BYTE, enum: ProcessProgramAck, param: ack}
 
+  # =====================================================================
+  # E42 — Enhanced (formatted) Process Programs (S7F23–F26).
+  #
+  # An enhanced PP is a list of (CCODE, params) rows: each row is one
+  # command + its parameters.  Unlike the opaque PPBODY in S7F3/F6
+  # (which is just a text blob), the formatted form lets the host
+  # inspect / synthesize a recipe step-by-step.
+  #
+  # CCODE is a free-form ASCII command name (e.g. "HEAT", "GAS_FLOW",
+  # "STEP_END"); each parameter is a (PNAME, PVAL) pair where PVAL is
+  # any SECS-II Item (carried as ITEM in the schema).
+  # =====================================================================
+
+  - id: S7F23
+    stream: 7
+    function: 23
+    w: true
+    builder: s7f23_formatted_pp_send
+    parser: parse_s7f23
+    body:
+      kind: list
+      struct_name: FormattedProcessProgram
+      fields:
+        - {name: ppid, shape: {kind: scalar, item_type: ASCII}}
+        - {name: mdln, shape: {kind: scalar, item_type: ASCII}}
+        - {name: softrev, shape: {kind: scalar, item_type: ASCII}}
+        - name: steps
+          shape:
+            kind: list_of
+            element:
+              kind: list
+              struct_name: FormattedStep
+              fields:
+                - {name: ccode, shape: {kind: scalar, item_type: ASCII}}
+                - name: params
+                  shape:
+                    kind: list_of
+                    element:
+                      kind: list
+                      struct_name: FormattedParam
+                      fields:
+                        - {name: name,  shape: {kind: scalar, item_type: ASCII}}
+                        - {name: value, shape: {kind: scalar, item_type: ITEM}}
+
+  - id: S7F24
+    stream: 7
+    function: 24
+    builder: s7f24_formatted_pp_ack
+    body: {kind: scalar, item_type: BINARY_BYTE, enum: ProcessProgramAck, param: ack}
+
+  - id: S7F25
+    stream: 7
+    function: 25
+    w: true
+    builder: s7f25_formatted_pp_request
+    parser: parse_s7f25
+    body: {kind: scalar, item_type: ASCII, param: ppid}
+
+  - id: S7F26
+    stream: 7
+    function: 26
+    builder: s7f26_formatted_pp_data
+    parser: parse_s7f26
+    body:
+      kind: list
+      struct_name: FormattedProcessProgram
+      fields:
+        - {name: ppid, shape: {kind: scalar, item_type: ASCII}}
+        - {name: mdln, shape: {kind: scalar, item_type: ASCII}}
+        - {name: softrev, shape: {kind: scalar, item_type: ASCII}}
+        - name: steps
+          shape:
+            kind: list_of
+            element:
+              kind: list
+              struct_name: FormattedStep
+              fields:
+                - {name: ccode, shape: {kind: scalar, item_type: ASCII}}
+                - name: params
+                  shape:
+                    kind: list_of
+                    element:
+                      kind: list
+                      struct_name: FormattedParam
+                      fields:
+                        - {name: name,  shape: {kind: scalar, item_type: ASCII}}
+                        - {name: value, shape: {kind: scalar, item_type: ITEM}}
+
   # =====================================================================
   # S9 — Protocol error notifications (E5).  All carry the 10-byte
   # offending message header (MHEAD) as a single BINARY item, except