Update docs for named volume config, skillset auto-deploy, opencode.jsonc

- README: rewrite config/skills sections for named volume and auto-deploy,
  add Context7 MCP docs, update all opencode.json→opencode.jsonc refs,
  add SKILLSET_CONTAINER_PATH to env var table
- CHANGELOG: add v1.14.32b entry documenting breaking changes and features
- AGENTS.md: update file roles, add skillset and config volume conventions
- DOCKER_HUB.md: regenerated (drop Context7 and Shell defaults sections
  to stay within 25KB Docker Hub limit)
- generate-dockerhub-md.py: add Context7 (drop) and Shell defaults (drop)
  to SECTION_RULES

scripts/generate-dockerhub-md.py

@@ -66,7 +66,8 @@ SECTION_RULES: dict[str, str] = {
     "AWS Bedrock Authentication": "keep",
     "MemPalace — persistent AI memory": "keep",
     "Gitea MCP server": "keep",
-    "Shell defaults": "keep",
+    "Context7 MCP server": "drop",
+    "Shell defaults": "drop",                   # detail, full README covers it
     "Secret Scanning": "drop",                  # dev-only — gitleaks is for committers
     "Architecture": "keep",
     "License": "replace",                       # point at source repo instead