Consolidate examples/, rename executables + library target

[josephnef]

What

Three long-standing paper cuts, fixed in one clean break (no back-compat aliases):

1. One examples/ tree instead of three demo directories. demo/, txdemo/, and examples/ collapse into a single examples/, one directory per demo, with examples/common/ holding the shared stream_stdin.h framing + its selftest. All moves are git mv (history preserved).

2. Short executable names. The old names overflowed the kernel's 15-char comm limit — pkill -x WiFiDriverTxDemo (16 chars) was a silent no-op, and we've burned real debugging time on the truncated-comm workarounds scattered through the test scripts.

old	new
WiFiDriverDemo / WiFiDriverTxDemo	rxdemo / txdemo
StreamTxDemo / StreamDuplexDemo	streamtx / duplex
SvcTxDemo / PrecoderDemo	svctx / precoder
TxPowerStepDemo / WiFiSenseDemo	txpower / sense

Every truncated workaround form (WiFiDriverTxDem, StreamDuplexD, StreamTxDem, …) is gone, including one latent bug: eu_kernel_baseline.sh ran pkill -x WiFiDriverDe, which matched nothing, ever. Selftest targets keep their names (ctest-only, never pkill targets).

3. Library target says what it is. CMake target + project() renamed WiFiDriver → devourer; link with devourer, archive is libdevourer.a. The WiFiDriver.h header and WiFiDriver class are unchanged — source-level consumers don't change a line.

All ~400 references across tests/, tools/, docs/, README, CLAUDE.md, and the CI workflow are updated in this one commit.

Validation

• Fresh full build (all chips) — all 8 example binaries + libdevourer.a; ctest 10/10
• Two gated per-chip configs (jaguar1-only; no-jaguar2) build + ctest green
• The mingw CI job's exact target list resolves locally
• Leftover grep: zero hits for old names / truncated forms / stale paths; remaining WiFiDriver occurrences are the class/header only
• bash -n all test scripts, py_compile all python
• On-air: txdemo → kernel RX 7119/7500 hits ✓; devourer/devourer rxdemo+txdemo 8000/8000 hits ✓ (8822CU→8812EU, ch36)

Note for downstream

Old-name binaries linger in stale build dirs — do a clean build, or a running stale WiFiDriverDemo will dodge pkill -x rxdemo.

🤖 Generated with Claude Code