chore: remove stale "Epic 12" internal reference from packages/swap/package.json

[toon-backlog-bot]

Closes #28

Summary

• Changed packages/swap/package.json description from "TOON Swap — multi-chain payment-channel claim issuer for the Token Swap Primitive (Epic 12)" to "TOON Protocol swap node — multi-chain payment-channel claim issuer (EVM/Solana/Mina)".
• Added an empty changeset (no version bump — metadata-only chore).

Verification

node -e "JSON.parse(require('fs').readFileSync('packages/swap/package.json','utf8'))"
# → JSON valid

! grep -n "Epic 12|Token Swap Primitive" packages/swap/package.json
# → Not found (good)

pnpm -r build && pnpm -r test
# Build: ⚡️ Build success
# Tests: 10 test files, 130 passed | 2 skipped — all green

Plan deviation

None. Followed the Agent Assessment plan exactly.

[ALLiDoizCode]

Reviewed description change and changeset. New description aligns exactly with CLAUDE.md canonical wording; stale 'Epic 12 / Token Swap Primitive' text is gone. Empty changeset frontmatter is valid changesets syntax for a chore with no version bump. PR title and body are accurate. No corrections needed.

[ALLiDoizCode]

LGTM — no blocking issues found. New description aligns with CLAUDE.md canonical wording; stale 'Epic 12 / Token Swap Primitive' text is removed. Empty changeset frontmatter is valid for a chore with no version bump. PR title and body are accurate.