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.

5_Simulations/Antenna/edge_fed_aeris10_v3.py

@@ -267,7 +267,7 @@ print(f"  Edge-fed (inset) on 0.508 mm RO4350B (W={PATCH_W} L={PATCH_L} inset={I
 print(f"  Resonance (R peak + Im=0): {f_res/1e9:.3f} GHz   (target 10.5 GHz)")
 print(f"  S11 at resonance     : {s11_min:.2f} dB")
 print(f"  Zin at resonance     : {zin[i_res].real:.1f} + j{zin[i_res].imag:+.1f} Ω")
-print(f"  ── at 10.500 GHz exactly:")
+print("  ── at 10.500 GHz exactly:")
 print(f"  S11 @ 10.5GHz        : {s11_dB[i_op]:.2f} dB")
 print(f"  Zin @ 10.5GHz        : {zin[i_op].real:.1f} + j{zin[i_op].imag:+.1f} Ω")
 print(f"  VSWR @ 10.5GHz       : {vswr[i_op]:.2f}")
@@ -286,7 +286,7 @@ if (f_hi-f_lo) > 0:
                label=f"BW {(f_hi-f_lo)/1e6:.0f} MHz ({bw_pct:.2f}%)")
 ax.set_xlabel("Frequency (GHz)")
 ax.set_ylabel("S11 (dB)")
-ax.set_title(f"AERIS-10 Edge-Fed (inset) — 2-layer 0.508 mm RO4350B")
+ax.set_title("AERIS-10 Edge-Fed (inset) — 2-layer 0.508 mm RO4350B")
 ax.set_xlim(F_START/1e9, F_STOP/1e9)
 ax.set_ylim(-40, 0)
 ax.grid(True, alpha=0.3)