docs: correct file naming convention — foundational docs are ALL-CAPS

The previous naming guide was incomplete. The actual convention is:

**Foundational docs:** ALL-CAPS
- Root entry-points: AGENTS.md, README.md (discovery paths)
- Agent instruction: .agents/OIKOS.md, .agents/HERMES.md (docs agents read first)
- Reference docs: GLOSSARY.md (like classic repo files: LICENSE, CHANGELOG)

**Content pages:** lowercase-with-dashes
- Containers: <id>-<name>.md (ID from inventory)
- Infrastructure: <topic>.md (system description)
- Plans/investigations: YYYY-MM-DD-slug.md (date-sorted)
- Section indices: README.md (conventional)

**Skills:** special pattern
- <name>/SKILL.md where <name> is lowercase-with-dashes
- SKILL.md filename is always uppercase — signpost for tools and humans

Uppercase is reserved for foundational/signpost docs; all paths otherwise use
lowercase with hyphens (no underscores).

Updated page-templates.md with expanded explanation, and updated AGENTS.md +
README.md to reference the corrected convention.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

AGENTS.md

@@ -78,9 +78,9 @@ Grep is fine for browsing or when MCP is unreachable.
 See [page-templates.md](.agents/shared/page-templates.md) for file naming, page
 structure, and the tone standard. Quick reference:
 
-- **File naming:** Root entry-points are ALL-CAPS (`AGENTS.md`); containers use
-  `<id>-<name>.md`; infrastructure uses lowercase-with-dashes; plans and investigations
-  use `YYYY-MM-DD-slug.md`; skills are folders with `SKILL.md` inside.
+- **File naming:** Foundational docs are ALL-CAPS (AGENTS.md, OIKOS.md, GLOSSARY.md);
+  containers use `<id>-<name>.md`; infrastructure uses lowercase-with-dashes; plans
+  and investigations use `YYYY-MM-DD-slug.md`; skills are `<name>/SKILL.md`.
 - **Where pages live:** Narrative under `knowledge/wiki/{containers,hosts,vms,infrastructure}/`;
   incident records under `knowledge/sources/investigations/`; runbook procedures under
   `.agents/skills/<name>/SKILL.md`; operator reference under `.agents/operations/`;