docs(coverage): sync coverage docs to verified 98.91% library figure

Measured library-scope coverage live (pytest with --cov-config=.coveragerc.library):
98.91% combined (~99% statement / ~98% branch), gate fail_under=95 reached, full
suite green (2 skipped). Updated ROADMAP.md and docs/security_compliance.md from the
inherited ~96% estimate to the measured figure, and logged the 90->95 gate raise in
CHANGELOG [Unreleased].

Author: Gavin-Borges

CHANGELOG.md

@@ -16,6 +16,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
   protected by required-reviewer approval before any upload proceeds.
   Deleted orphaned `environments/requirements-ci-twine.{in,txt}`.
 - **`pyproject.toml`**: removed personal email from author metadata; name retained.
+- **Library coverage gate raised** `90 -> 95` in `.coveragerc.library`. Verified
+  library-scope coverage is **98.91% combined** (~99% statement / ~98% branch;
+  measured 2026-06-22), comfortably clearing the new gate and the OpenSSF Gold
+  targets. Synced the stale `fail_under` references in `docs/security_compliance.md`,
+  `ROADMAP.md`, and the `ci.yml` step comment to the authoritative config value.
 
 ### Added
 - **HBV/HCV proteome ingestion path** (issue #78): `scripts/fetch_viral_proteomes.py`

ROADMAP.md

@@ -21,7 +21,7 @@ _Last updated: 2026-06._
     library surface - `src`/`functions` modules without a `__main__` CLI entry
     point. Measured via `.coveragerc.library` (omit list generated mechanically by
     `tools/check_library_coverage.py`, kept in sync by `--check`). Currently
-    **≈96% statement / ≈94% branch** (combined ≈96%), gated at `fail_under=95`.
+    **~99% statement / ~98% branch** (combined 98.91%), gated at `fail_under=95`.
     This clears the OpenSSF **Gold** targets (≥90% statement, ≥80% branch).
   - **Whole-repo floor**: `pyproject.toml`'s `fail_under` blocks regressions across
     the entire tree (research/CLI scripts included), gated at `fail_under=35`,

docs/security_compliance.md

@@ -25,8 +25,9 @@ This document tracks SESTRAV's posture against the [OpenSSF Best Practices Badge
   measured on two scopes, both gated in CI:
   - *Library scope* - the importable library surface (`src`/`functions` modules
     with no `__main__` CLI entry point), measured via `.coveragerc.library` and
-    gated at `fail_under=95`. Currently ≈96% statement / ≈94% branch-inclusive,
-    clearing the OpenSSF Gold targets (>=90% statement, >=80% branch).
+    gated at `fail_under=95`. Currently 98.91% combined (~99% statement /
+    ~98% branch; measured 2026-06-22), clearing the OpenSSF Gold targets
+    (>=90% statement, >=80% branch).
     The omit list is generated mechanically from the presence of a `__main__`
     guard (`tools/check_library_coverage.py --check` enforces it stays in sync),
     so the scope is objective rather than hand-picked.