piperepl patch rev: TCLSH_PIPEREPL_DEBUG-gated reopen notice on stderr; publish ::tclsh(reopened) (G-118 items 1+7)

In-source rev of tclMain_piperepl_905.c, effective at the next suite rebuild
(the G-117 cycle): the '? reopen stdin from console' notice prints only when
TCLSH_PIPEREPL_DEBUG is set truthy; all reopen-path messages (gated notice +
genuine failure messages) move from stdout to stderr; ::tclsh(reopened)
published as an unlinked fact (0 at gate-open startup, republished 1 after a
successful console reopen). 2024-era artifacts (tclMain_piperepl.c, .patch)
stay unmodified per the recovery policy.

Assisted-by: harness=claude; primary-model=claude-fable-5; api-location=anthropic.com

src/buildsuites/suite_tcl90/patches/README.md

@@ -51,9 +51,13 @@ that sets dorepl opts into prompts/echo in the reopened repl); and a script-arg
 launch from a CONSOLE READS 1 where stock reads 0 (stock sets it once to
 `!path && istty`; the early link overwrites that with the tty flag. Piped launches
 read 0 either way, so only console script runs diverge for readers - verified
-against punk9_beta 2026-07-23). Known residue: on the eof-with-dorepl path the
+against punk9_beta 2026-07-23). Patch rev 2026-07-24 (G-118 items 1+7; in-source, effective at the next suite
-patch unconditionally prints "? reopen stdin from console" to STDOUT (debug-era
+rebuild - the G-117 cycle): the "? reopen stdin from console" notice is emitted
-message); quieting/stderr/env-gating it needs a patch rev + suite rebuild. Note the
+only when TCLSH_PIPEREPL_DEBUG is set truthy (stock prints nothing entering a
+repl), and the reopen-path messages (gated notice + genuine failure messages)
+moved from stdout to STDERR; ::tclsh(reopened) is published as an unlinked fact
+(0 at gate-open startup, republished 1 after a successful console reopen) -
+previously inferable only via `info exists ::tclsh(inputbuffer)`. Note the
 punkshell-level analogue for the punk repl is G-038 (piped-to-interactive session
 continuity) - this patch is the plain-tclsh/kit-runtime counterpart.
 

src/buildsuites/suite_tcl90/patches/tclMain_piperepl_905.c

@@ -412,6 +412,20 @@ Tcl_MainEx(
 	   Tcl_DStringFree(&ds);
 	}
     }
+    int pipeReplDebug;
+    {
+	const char *s;
+	Tcl_DString ds;
+	s = TclGetEnv("TCLSH_PIPEREPL_DEBUG", &ds);
+	/* G-118 item 1 (2026-07-24): patch diagnostics such as the console-reopen
+	 * notice print only when TCLSH_PIPEREPL_DEBUG is set truthy (not "0") -
+	 * stock tclsh prints nothing when entering a repl. Genuine reopen
+	 * FAILURES stay unconditional (now on stderr). */
+	pipeReplDebug = ((s != NULL) && strcmp(s, "0"));
+	if (s != NULL) {
+	   Tcl_DStringFree(&ds);
+	}
+    }
     piperepl.reopened = 0;
     piperepl.dorepl = 0;
     piperepl.evalinput = 0;
@@ -430,6 +444,10 @@ Tcl_MainEx(
 	    Tcl_NewBooleanObj(ttyAtStart), TCL_GLOBAL_ONLY);
 	Tcl_SetVar2Ex(interp, "tclsh", "evalinput",
 	    Tcl_NewBooleanObj(piperepl.evalinput), TCL_GLOBAL_ONLY);
+	//unlinked fact - republished as 1 when stdin is reopened from the
+	//console after eof-with-dorepl (G-118 item 7)
+	Tcl_SetVar2Ex(interp, "tclsh", "reopened",
+	    Tcl_NewBooleanObj(0), TCL_GLOBAL_ONLY);
     }
 
     Tcl_SetVar2Ex(interp, "tcl_interactive", NULL,
@@ -622,10 +640,12 @@ Tcl_MainEx(
 		 */
 
 		if (piperepl.dorepl) {
-		    chan = Tcl_GetStdChannel(TCL_STDOUT);
+		    chan = Tcl_GetStdChannel(TCL_STDERR);
 		    inputReopen--;
 		    if (inputReopen >= 0) {
+			if (pipeReplDebug) {
 			    Tcl_WriteChars(chan, "? reopen stdin from console \n", -1);
+			}
 			if (is.input != NULL) {
 			    //Tcl_UnregisterChannel should close stdin without killing console?
 			    if (Tcl_UnregisterChannel(interp, is.input) != TCL_OK) {
@@ -645,6 +665,8 @@ Tcl_MainEx(
 			} else {
 			    piperepl.reopened = 1;
     			    Tcl_SetVar2Ex(interp, "tclsh", "inputbuffer", piperepl.inputbuffer, TCL_GLOBAL_ONLY);
+    			    Tcl_SetVar2Ex(interp, "tclsh", "reopened",
+    				Tcl_NewBooleanObj(1), TCL_GLOBAL_ONLY);
 			    Tcl_SetChannelOption(interp, is.input, "-blocking", "1");
 			    Tcl_SetChannelOption(interp, is.input, "-buffering", "line");
 			    Tcl_SetStdChannel(is.input,TCL_STDIN);