feat(cli)!: add TOML config file support

Add a structured config file so common defaults can live in one place
instead of being repeated in aliases or shell wrappers. CLI flags keep
precedence, which keeps one-off overrides predictable.

Use tomlq only when a config file is present, and fail early on missing
dependencies or invalid TOML so configuration mistakes do not silently
change encode behavior.

Move the persistent skip-codec list from the legacy skip.conf file to
[skip] codecs in config.toml. Config codecs are merged with --skip-codec
so global defaults and per-run skips can be combined.

Document the new format in the README and man page, update dependency
notes, and extend bash completion for config-file paths and the new
negative boolean flags.

BREAKING CHANGE: skip.conf is no longer read for codec skips. Migrate
its entries to [skip] codecs in config.toml and remove the old file.

BREAKING CHANGE: --encodefile and --encodefile= are replaced by
--encode-file and --encode-file=. Update scripts, aliases, and
completion usage to use the hyphenated option name.

1 files changed, 21 insertions, 7 deletions

diff --git a/transcode.sh.bash-completion b/transcode.sh.bash-completion
index ce153dd..59a9c8d 100644
--- a/transcode.sh.bash-completion
+++ b/transcode.sh.bash-completion
@@ -6,8 +6,8 @@
 #
 # Each option that takes an argument is supported in all three forms:
 #   short          -f list.txt
-#   long space     --encodefile list.txt
-#   long equals    --encodefile=list.txt
+#   long space     --encode-file list.txt
+#   long equals    --encode-file=list.txt
 
 _transcode_sh() {
     local cur prev words cword
@@ -40,7 +40,12 @@ _transcode_sh() {
     # This must be checked before the $prev dispatch below.
     # ---------------------------------------------------------------------------
     case "$cur" in
-        --encodefile=*)
+        --config-file=*)
+            cur="${cur#*=}"
+            _filedir
+            return
+            ;;
+        --encode-file=*)
             cur="${cur#*=}"
             _filedir
             return
@@ -69,11 +74,15 @@ _transcode_sh() {
 
     # ---------------------------------------------------------------------------
     # Handle VALUE after short form (-f, -N, -S, -p) and
-    # long space form (--encodefile, --nice, --saving-file, --skip-codec, --preset).
+    # long space form (--encode-file, --nice, --saving-file, --skip-codec, --preset).
     # $prev is the option word, $cur is the value being typed.
     # ---------------------------------------------------------------------------
     case "$prev" in
-        -f|--encodefile)
+        --config-file)
+            _filedir
+            return
+            ;;
+        -f|--encode-file)
             _filedir
             return
             ;;
@@ -106,17 +115,22 @@ _transcode_sh() {
         --*)
             local longopts='
                 --continue
-                --encodefile
-                --encodefile=
+                --no-continue
+                --config-file
+                --config-file=
+                --encode-file
+                --encode-file=
                 --dry-run
                 --nice
                 --nice=
                 --saving
+                --no-saving
                 --saving-file
                 --saving-file=
                 --skip-codec
                 --skip-codec=
                 --only-if-smaller
+                --no-only-if-smaller
                 --preset
                 --preset=
                 --help