chore(meta): update changelog for review-fix pass (PR #136)

Corrects the "three generators" wording after the brand pipeline merge.

Refs: PR #136

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -8,7 +8,7 @@ Format based on [Keep a Changelog](https://keepachangelog.com/).
 
 ### Added
 - **Asset pipeline discipline** (#854, #855, #856, #857, #858, #859) — `systems.db` is now a source-canonical snapshot with a `meta` table stamped by every generator (SHA of source + schema). Pre-push hook rejects stale DBs; `/pr-push` auto-runs `make regen-db` when generator sources change. Full rules in `.claude/rules/asset-pipeline.md`
-- **`make regen-db`** — runs all three generators (generate_brands, import_economics, generate_atlas) and stamps the meta table
+- **`make regen-db`** — runs the two DB-writing generators (import_economics, generate_atlas) and stamps the meta table. import_economics now invokes the Rust generate_brands binary internally as its first step, so the brand pipeline is owned by a single stamp.
 - **`make check-systems-db`** — verifies the meta stamp matches current generator sources
 - **`make install-hooks`** — installs pre-push and pre-commit hooks in one step
 - **`tooling/db/decision show <D-NNN>`** (#723) — drill-down view of a decision with implementing tickets and cross-refs