Fix polytonic-Greek mid-word truncation in CI-built PDF

[jbkjr]

Summary

• Fixes the bug where Greek terms in Part XV of the deployed glossary PDF render only up through their first GreekExtended character (the σ in νοῦς, ν in τὸ ἕν, σία in οὐσία, etc.) — visible in the deployed PDF but not in local builds.
• Root cause: in scripts/glossary/header.tex, two consecutive \setTransitionsFor calls (for GreekAndCoptic and GreekExtended) overwrite each other's cross-pair token registers via \XeTeXinterchartoks. Whichever runs second wins, so the GE→GAC boundary ends up firing \normalfont — and on CI the main font lacks polytonic Greek, so trailing GAC characters render as missing glyphs.
• Fix: explicitly null both directions of the GAC↔GE pair after the \setTransitionsFor calls, so \greekfont (set by the Latin→Greek entry transition) stays active across the boundary.
• Adds glossary.pdf artifact upload to ci-check.yml so the deployed-style PDF can be downloaded and visually inspected on each PR (kept permanently). Also adds a temporary fc-list diagnostic step (will be removed in a follow-up commit before merge).

Test plan

• Confirm CI build succeeds on Ubuntu 22.04
• Download the glossary-pdf artifact from this PR's checks page
• Visually verify all Part XV Greek terms render fully:
  • Plotinian: to hen (τὸ ἕν), nous (νοῦς), psychē (ψυχή), hypostasis (ὑπόστασις), monad (μονάς), ousia (οὐσία)
  • Apophatic: hyperousia (ὑπερουσία / ὑπερούσιος), apophasis (ἀπόφασις)
  • Modes of knowing: noēsis (νόησις), gnosis (γνῶσις)
  • Contemplation: theōria (θεωρία), epistrophē (ἐπιστροφή), henōsis (ἕνωσις), theōsis (θέωσις)
  • Love: eros (ἔρως), agape (ἀγάπη)
  • Christian-mystical: plērōma (πλήρωμα), kenosis (κένωσις)
• Confirm fc-list :lang=el output in the CI log shows Noto Serif (precondition: \greekfont resolves to a font with full polytonic coverage)
• Drop the temporary Debug font availability step before merge

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