chore(agent): drop .claude/skills — AGENTS.md carries the routing

The skill shims became redundant once the auto-loaded entry point
(CLAUDE.md → AGENTS.md) explicitly instructs reading VERIFICATION.md /
THEME-DESIGN.md; their only remaining value was explicit /nomarchy and
/theme invocation. The adapter is now permissions + subagent defs only.
References updated (AGENTS.md, agent/README.md, docs/README.md, README
tree, MEMORY.md hygiene note).

Verification: V0 (docs/meta only).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

agent/README.md

@@ -42,7 +42,6 @@ into the files above, in whatever format their harness requires.
 | [../AGENTS.md](../AGENTS.md) | any | Entry point (`CLAUDE.md` is a symlink to it) |
 | [../.claude/settings.json](../.claude/settings.json) | Claude Code | Tool permissions |
 | [../.claude/agents/](../.claude/agents/) | Claude Code | `nomarchy-scout` / `nomarchy-runner` role defs (contracts in [DELEGATION.md](DELEGATION.md)) |
-| [../.claude/skills/](../.claude/skills/) | Claude Code | Skill shims → VERIFICATION/DELEGATION/THEME-DESIGN |
 
 Do **not** put backlog items, vision text, or policy under an adapter
 directory — it is not shared with other agent runners.