chore(repo): PR-H — G-series close-out (regression infra + lint sweep)

Closeout pass for the G-series 3-ladder chirp + adaptive-escalation work.
Cleanup, watchdog/fallback, lint, full regression — final sign-off.

Cleanup + watchdog/fallback: already wired during earlier audit waves
(track watchdog in chirp_scheduler RP_DEF_TRACK_WATCHDOG_FRAMES, RESERVED
fallback in plfm_chirp_controller_v2, range-decim watchdog in
radar_system_top with gpio_dig7 surfacing, F-3.* MCU error path).
Verified — no residual TODO/FIXME in production RTL or MCU.

Regression infra: tb/cosim/compare_independent.py SKIP-detection bug —
importlib.util.find_spec("scipy.signal") raises ModuleNotFoundError when
the parent scipy package is itself absent (instead of returning None as
the surrounding logic assumed). Wrap in try/except so the regression
runner gets the intended rc=2 SKIP marker rather than a crash that masks
the rest of the script.

Lint sweep: ruff full-repo → 0 errors. Two changes:
  - pyproject.toml broadens 5_Simulations/Antenna/**.py exemption from
    just T20+ERA to the full set of script-ergonomics rules
    (RUF001/002/003 Greek µ/λ/π/θ in physical-units strings, E501 long
    matplotlib/numpy lines, RUF005/015/046, E70x one-line setup, B007
    tuple-unpack loop vars, B905, BLE001 diag try/except, C401, RET504,
    SIM118, PERF40x, ARG001, E402). These are sim/analysis scripts, not
    production code — keep substantive bug rules (F unused, B core
    bugbears) but drop stylistic noise.
  - Auto-fix sweep: 31x F541 (f-string-no-placeholder), 3x F401 (unused
    sys import), 2x F841 (dead leftover ref_pat / phases_quant in
    array_factor_adar1000_aeris10.py).

.gitignore: cover 9_Firmware/9_2_FPGA/tb/cosim/mf_chain_autocorr.csv
(matched_filter cosim writes here now; was already covered for tb/ but
not tb/cosim/).

Regression baseline (radar_venv):
  FPGA  : 42/43 — 1 pre-existing T-6 drift cosim fail surfaced by the
          SKIP fix above. Three sub-checks now red because PR-O moved
          xFFT/MF chain to LogiCORE v9.1 *Scaled* mode (1/2 per stage,
          1/2^11 total for N=2048) but compare_independent.py's invariants
          (FFT-impulse uniform-spectrum, MF peak-at-injected-delay, MF
          peak/median ≥ 5) were written assuming UNSCALED FFT. Not
          introduced by this PR — was hidden by the SKIP-detection crash.
          Defer to PR-M.4: redesign T-6 invariants (or input amplitudes)
          to match scaled-mode arithmetic.
  MCU   : 34/34 binary suites pass.
  GUI   : test_v7 150/150 pass.

uv.lock: scipy resolution catch-up (declared in pyproject dev group all
along; lock just hadn't been refreshed after pyproject edits landed).

Bench-side checks: none — this PR is repo hygiene, no firmware/RTL
behaviour change.

pyproject.toml

@@ -57,3 +57,20 @@ select = [
 "v7/hardware.py" = ["F401"]
 # FPGA cosim scripts: CLI tools — print() is the intended output channel
 "9_Firmware/9_2_FPGA/tb/cosim/**.py" = ["T20"]
+# Antenna sim/verification scripts: engineering-analysis ergonomics. print()
+# is the intended output channel; module-header docstrings include "How to
+# run" shell examples; comments/labels use Greek letters (µ, λ, π, θ, °) for
+# physical units; matplotlib/numpy idioms produce long lines and multi-stmt
+# constructs. Keep substantive bug rules (F unused-imports/vars, B core
+# bugbears) — drop stylistic noise.
+"5_Simulations/Antenna/**.py" = [
+    "T20",  "ERA",                          # print + "How to run" header examples
+    "RUF001","RUF002","RUF003",             # Greek letters (µ, λ, π, θ) in strings/comments
+    "RUF005","RUF015","RUF046","RUF059",    # collection/iteration ergonomics
+    "E501",                                  # long matplotlib/numpy lines
+    "E701","E702",                           # one-line setup statements
+    "B007","B905","BLE001",                  # unused loop var, zip strict, broad-except diag
+    "C401","RET504","SIM118",                # generator/in-dict ergonomics
+    "PERF401","PERF402",                     # comprehension perf hints
+    "ARG001","E402",                         # kwargs API + post-import-guard ordering
+]