svf: extract player core into standalone libsvf, keep bscan glue

The SVF player now lives in electronics/libsvf behind a five-function
JTAG ops table, shared with the wifi_jtag_programmer Zephyr firmware.
src/modules/svf/ shrinks to the bscan_*-backed port (bs_svf_play),
which also keeps the FTDI stale-FIFO warm-up. Local checkout override:
-DFETCHCONTENT_SOURCE_DIR_SVF=<path>.

CLAUDE.md

@@ -23,9 +23,13 @@ new is in `src/bs/` (the REPL) and the project modules (`target/`,
 sitting alongside the Viveris ones. The BSDL parser was extracted into
 a standalone library, **[libbsdl](ssh://gitea@git.beafrancois.fr:8329/electronics/libbsdl.git)**
 (LGPL, seeded from the same Viveris loader), and is now pulled in via
-CMake `FetchContent` instead of vendored. To build against a local
-checkout (e.g. side-by-side dev): configure with
-`-DFETCHCONTENT_SOURCE_DIR_BSDL=/path/to/libbsdl`.
+CMake `FetchContent` instead of vendored. The SVF player core moved the
+same way into **[libsvf](ssh://gitea@git.beafrancois.fr:8329/electronics/libsvf.git)**
+(shared with the `wifi_jtag_programmer` Zephyr firmware, which plays SVF
+through an embedded JTAG port); `src/modules/svf/` is now only the
+bscan-backed glue. To build against local checkouts (side-by-side dev):
+configure with `-DFETCHCONTENT_SOURCE_DIR_BSDL=/path/to/libbsdl` and/or
+`-DFETCHCONTENT_SOURCE_DIR_SVF=/path/to/libsvf`.
 
 ## Architecture
 
@@ -41,14 +45,15 @@ src/
     ├── config/            Built-in config.script
     ├── os_interface/      Portable fs/network wrappers
     └── natsort/           Natural pin-name sorting
-    — pulled via FetchContent (LGPL, separate repo) —
-    └── (libbsdl)          BSDL (.bsd) parser; struct + JSON; stable C ABI
+    — pulled via FetchContent (LGPL, separate repos) —
+    ├── (libbsdl)          BSDL (.bsd) parser; struct + JSON; stable C ABI
+    └── (libsvf)           portable SVF player core (svf_play_buf/file over a 5-op JTAG port)
     — new (this project) —
     ├── target/            Target registry: FPGAs + CPUs (parses data/targets.yaml)
     ├── bscan/             JTAG TAP primitives (set_ir/shift_ir/shift_dr/tap_reset/
     │                      idle_cycles) + BSCAN proxy (bitstream load, SPI-over-USER1)
     ├── spi_flash/         SPI NOR chip DB + read/erase/program/verify over a callback
-    ├── svf/               SVF player (svf_play): SIR/SDR/RUNTEST/STATE, masked compare
+    ├── svf/               glue: bscan_*-backed svf_jtag_ops port for libsvf (bs_svf_play)
     ├── probes/            Probe-config profiles loader (parses data/probes.yaml, libyaml)
     ├── program/           `program` dispatch: routes a target to its backend by `prog`
     └── arm_debug/         ARM7TDMI (EmbeddedICE) debug: halt/resume, Thumb->ARM, memory read (works); flash-write backend TODO