chore(governance): thin-proxy CLAUDE.md refactor — add prompts/ submodule and .claude/rules/ #75
Description
Summary
Apply the CLAUDE.md thin-proxy refactor pattern (documented in cybermonkey/prompts#564) to eos.
The existing CLAUDE.md is 1833 lines, far exceeding the 200-line soft limit and 400-line hard limit enforced by `scripts/check-claude-md-size.sh`.
Changes
- Add `prompts/` submodule: `ssh://git@vhost7:9001/cybermonkey/prompts.git` — gives access to all governance contracts via `@prompts/` @imports
- Replace CLAUDE.md: 1833-line monolith → 75-line thin proxy (within budget)
- Extract to `.claude/rules/` (path-scoped, loaded on demand):
- `go-patterns.md` → loads on `**/*.go` — architecture, constants, logging, idempotency
- `cli-patterns.md` → loads on `cmd/**/*.go` — cmd/pkg separation, flag validation, human-centric input
- `secrets-vault.md` → loads on `pkg/vault/`, `pkg/consul/` — Vault/Consul patterns, token auth
- `debugging.md` → loads on `cmd/debug/**` — diagnostic logging, evidence collection
- Profile: `cybermonkey/prompts` profile `profiles/eos.yaml` created
Rationale
Frontier LLMs reliably follow ~150-200 instructions. A 1833-line CLAUDE.md means most rules are ignored due to context saturation. Path-scoped `.claude/rules/` files ensure the right rules load only when touching relevant code.
Refs: cybermonkey/prompts#564