v0.70.0

The theme of this release is the CRC code generator growing up and
moving out. What started as an in-tree helper for /proto.crc is now
crcglot, a standalone PyPI package with its own test matrix that
execution-verifies every algorithm in every target language on every
push. termapy depends on it like any other library, the supported
languages and variants are now discovered dynamically (so a new crcglot
release adds targets to termapy with no code change), and along the way
the generator gained streaming APIs, custom-parameter support,
slice-by-8 tables, and three new target languages. This release also
adds /find (interactive scrollback search) and rebuilds the command
palette on Textual's native widget.

CRC code generation extracted to crcglot

The CRC subsystem is now its own package. termapy declares a
crcglot>=0.8.0 dependency and imports the catalogue, the generators,
and the calculation kernel from it; nothing CRC-specific is vendored in
the termapy tree anymore.

The win is verification. crcglot ships its own CI that compiles and
runs generated code for every (algorithm x language x variant) cell and
checks it against the reveng catalogue's published check value -- over a
thousand exec tests per push. termapy no longer re-implements that;
its CRC tests are now thin dispatch smokes ("the REPL routed to crcglot
and got non-empty output back"). Correctness lives where the code lives.

/proto.crc.<lang> is now generated dynamically from
crcglot.LANGUAGES, so every language crcglot ships -- and every future
one -- appears automatically. This release surfaces eight targets:
C/C++, C#, Go, Python, Rust, TypeScript, Verilog, and VHDL.

Richer CRC generators

Folded in from the work that preceded the extraction:

• Streaming API -- every target now emits an init / update /
  finalize trio alongside the one-shot function, so generated code can
  CRC a stream without buffering it.
• Custom parameters -- supply your own Rocksoft parameters
  (width / poly / init / refin / refout / xorout) for an algorithm that
  isn't in the catalogue, plus symbol-from-file= to name the emitted
  function after a source file. Closes the ergonomic gap with pycrc.
• Slice-by-8 -- --slice8 emits eight-table slice-by-8 code for
  C and Rust (5-10x throughput on CRC-32/64). Python's --slice8
  warns and falls back to --table -- measured slice-by-8 is slower
  in CPython, so termapy refuses to ship a misleading codepath.
• CRC-64 -- the catalogue now covers every reveng CRC-64 variant.
• file=STEM output writes the generated source straight to disk
  with the right extension for the target language.
• Bitwise-only targets (Verilog, VHDL) now reject --table /
  --slice8 with a clear error instead of silently emitting bitwise.

There's also a new note in the docs: on most platforms CRC-32 /
CRC-32C run on dedicated CPU instructions and are ~10x faster than
other widths, so prefer them when you get to choose the algorithm.

/find -- interactive scrollback search

/find <pattern> searches the scrollback and lets you step through
matches with the matches highlighted in place -- a proper find loop
rather than a one-shot grep. It's wired into the command palette too.

Command palette rebuilt on Textual's native widget

The palette now uses Textual's built-in CommandPalette (top-center,
fuzzy filter, keyboard-first) instead of the hand-rolled bottom-docked
list. New entries cover find, grep, help search, and load-and-run
script; the bottom bar gains a ≡ palette button paired with /.

Config schema v22: serial keys nested

pyserial settings (port, baud_rate, etc.) now live under a
cfg["serial"] section instead of at the top level. Older configs
migrate forward automatically with chatty per-step output, and a config
written by a newer termapy gets the correct upgrade hint rather than a
wall of "unknown key (typo?)" noise.

Improvements

• Live port pickers -- the PortPicker and QuickSetup dialogs now
  poll for USB plug/unplug and update the list in real time.
• Tooltips everywhere -- every interactive dialog widget gained a
  tooltip; new StrongCheckbox for emphasis.
• Faster test suite -- pytest-xdist runs -n auto by default
  (~2.1x on an 8-core machine).
• Windows test-env robustness -- the suite auto-corrects the
  msys2 PATH ordering that breaks the Git-Bash gcc toolchain (emitting
  a RuntimeWarning so the fix is visible), and 27 stale CLI
  subprocess tests broken by the v22 nesting were repaired.
• Ghost-text command suggestions now include --flags.
• CmdResult.ok requires value= (type-checked) and auto-resolves
  Path values to absolute strings.
• User text is escaped before being wrapped in Rich color tags in
  search highlighting and CLI output.
• A bare prefix character no longer crashes dispatch.