docs: P8 vocabulary governance + WSL run tribal knowledgedev

- AGENTS.md §4 'Naming & vocabulary': wire to GLOSSARY.md (P8 — never coin a
  synonym for an existing concept; propose new terms, don't coin silently).
- AGENTS.md §8 'Tribal knowledge (notes/)': establish notes/<topic>.md as the
  non-inferable-knowledge store with the P6 test.
- Rename study_segment_seek_target -> study_portion_seek_target ('segment' was
  a glossary-proscribed synonym for 'speaking portion'); fix 'Section nav' /
  'jump to start' comments to canonical terms (portion nav / seek).
- notes/wsl-arch-razer-run.md: how to run the desktop app under WSLg on the
  Arch/Razer dev machine (the LIBGL_ALWAYS_INDIRECT segfault trap, required
  env vars, GPU driver options).

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