PR #148 merged at **99.67%** patch coverage — `codecov/patch` flagged seven by-construction-rare lines in three of the new indicators that no test exercised. This brings the batch back to 100%.
**`ht_dcphase` / `ht_trendmode`** (6 lines) — the dominant-cycle phase recovery guards against a near-zero imaginary part (where `atan(real/imag)` is undefined) by collapsing to ±90° on the sign of the real part. That branch is unreachable with realistic price data. Extracted the phase-unwrap arithmetic into a private `compute_dc_phase(real, imag, smooth_period)` helper — a pure refactor with byte-identical output — and unit-tested it directly with crafted `(real, imag)` pairs, covering both the ±90 collapse and the normal `atan` path.
**`sar_ext`** (1 line) — `Accel::validate`'s non-finite guard was only ever hit for non-positive terms, never non-finite ones, despite the test comment claiming both. Added `NaN` / `infinity` cases on the long and short acceleration schedules.
No behaviour or public-API change. Locally: `cargo test -p wickra-core` (2578 + 297 doctests) and `clippy --workspace -D warnings` all green.
kingchenc
f71b3b6b49