Add MicroslopSam TTS, Flextalk voice profiles, effects, and engine controls

microslopsam/SCOPE.md

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+# Scope
+
+## Goals
+
+1. Synthesize speech with the MSTTS voices (Sam, Mary, Mike) on Linux.
+2. Synthesize speech with the AT&T Flextalk 2.1 voices ("Keith Bell",
+   "Kerry Watson") on Linux, through the same host.
+3. Ship as a native Linux binary (Winelib first, pure-native later).
+4. Keep the engine contract limited to what `speech.h` defines, so other
+   SAPI4 engines can be added without host changes.
+5. Text in, WAV out. Pitch and speed adjustable.
+
+## Approach
+
+- Phase 1 (current): Winelib host + Wine-provided runtime. Fastest path to
+  working audio, and it doubles as the reference oracle for later work.
+- Phase 2: replace Wine-provided parts with own shims one at a time
+  (file I/O, threads, OLE2, window/message pump, finally MSVC EH/SEH).
+- Phase 3: pure-native rehost of `msttssyn.dll`; no Wine libraries.
+
+## Non-goals (for now)
+
+- GUI, SAPI4 telephony (`spchtel.dll`), Voice Command (`vcmd`), Agent support.
+- TruVoice voices (possible later; same L&H engine family).
+- 64-bit build (the engines are 32-bit).
+- Multi-platform audio (PipeWire/ALSA output comes after WAV works).