[information-architecture] Quick setup --continuous-improvement selector installs undocumented workflows

## Information Architecture Findings

### 1. `--continuous-improvement` installs workflows that are not part of its documented set
**Area:** Consistency
**Component(s):** `README.md` (lines 25-27, 39), `docs/workflows/gh-agent-workflows.md` (lines 28-30), `scripts/quick-setup.sh` (lines 128-141, 162-165)
**Problem:** The docs describe `--continuous-improvement` as a specific set of 11 add-on workflows, but the quick-setup selector actually appends 13 workflows by also adding `product-manager-impersonator` and `refactor-opportunist`. Users choosing this option from docs-guided setup get behavior that does not match the visible selection model, which makes workflow selection harder to reason about.
**Suggested improvement:** Align the selector definition across docs and installer behavior by either (a) documenting the full installed set everywhere `--continuous-improvement` is described, or (b) removing undocumented workflows from the appended list. Keep one canonical list and reference it from both docs pages.

## Suggested Actions
- [ ] Decide the intended `--continuous-improvement` workflow set (11 vs 13 entries)
- [ ] Update `scripts/quick-setup.sh` or docs so both reflect the same set
- [ ] Add a guard check (docs/script parity) to prevent selector drift

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