ci: build the Tcl auto-load modules and add a non-Tcl build job

Extend the Linux CI so consumers exercise more of what is buildable:

* In the Tcl job, after the default build, also build the per-module Tcl
  auto-load shared libraries (lef/plot/router/ext2spice/ext2sim
  tcl-main -> magiclef.so, tclplot.so, tclroute.so, exttospice.so,
  exttosim.so).  These are real products the default target never builds,
  so building them in CI keeps them from bit-rotting.

* Add a standard_build_linux job for the non-Tcl configuration
  (./configure --without-tcl): the native magic binary + bundled GNU
  readline -- code paths the Tcl build does not cover, and which only
  build now that the bundled-readline out-of-tree fixes landed.

NB: the standard job's apt package set is not validated on the runner;
adjust if a library is not found.  Docs remain best-effort in both jobs.

Not changed here: whether the five auto-load .so should also be shipped
by the default "make install" (they currently are not) -- left as a
separate decision.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.github/workflows/main.yml

@@ -24,3 +24,32 @@ jobs:
           ./configure
           make database/database.h
           make -j$(nproc)
+      - name: Build Tcl auto-load modules
+        # These per-module Tcl shared libraries are real products but are not
+        # part of the default target (their modules are not in PROGRAMS), so
+        # build them explicitly to keep them from bit-rotting.
+        run: |
+          for m in lef plot router ext2spice ext2sim; do
+            make -C "$m" tcl-main
+          done
+
+  standard_build_linux:
+    # Non-Tcl "standard" configuration: native magic binary + bundled GNU
+    # readline.  Distinct code paths (MAGIC_WRAPPER off, bundled readline) that
+    # the Tcl build above does not exercise.
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - name: Get Dependencies
+        # X11 + cairo for graphics; ncurses for the bundled readline's configure;
+        # texlive for the docs.  NB: package set not validated on the runner --
+        # adjust if the build cannot find a library.
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libx11-dev libcairo-dev libncurses-dev \
+            texlive-latex-base texlive-latex-recommended texlive-fonts-recommended
+      - name: Build (non-Tcl / standard)
+        run: |
+          ./configure --without-tcl --without-opengl
+          make database/database.h
+          make -j$(nproc)