feat(tools): include enriched dep changes in Discord release announcement

[towanTG]

Summary

The first Discord release announcement (from #92's publish) only showed • Update SwapKit SDK dependencies: (#91) — the enriched changes were dropped, and there was no per-package attribution. Two changes:

1. Include the enriched dep changes — bulletsInRange in tools/changelog.ts only collected top-level bullets, while enrich-dep-changelogs.ts writes the real underlying changes as indented sub-bullets. It gains an opt-in includeNested flag (still skipping nested refs under "Updated dependencies" blocks); default behavior unchanged, so the enricher is unaffected.

2. List every bumped package with its changeset since the last released version — the embed description is now one section per package group: the package@version heading(s), then that section's notes. Packages whose newest changelog sections carry identical changes (the usual case for a dep-bump release) are grouped under one heading instead of repeating the notes five times; packages with only internal dep bumps show "Dependency updates only.".

Only the just-released version's section is sliced per package — not the full changelog.

Dry-run against the actual 4.8.25 release

**@swapkit/sdk@4.6.33** · **@swapkit/wallet-extensions@4.5.19** · **@swapkit/wallet-hardware@4.9.20** · **@swapkit/wallet-mobile@4.3.13** · **@swapkit/wallets@4.8.25**
• Update SwapKit SDK dependencies: (#91)
   ↳ Ship CHANGELOG.md in the published package. … (sdk#274)
   ↳ Prefer a user-configured TON RPC URL (via SKConfig) over the Orbs-discovered endpoint. … (sdk#272)
   ↳ Resolve the Sui client RPC endpoint via getRPCUrl(Chain.Sui) … (sdk#269)
   ↳ Resolve the Sui client RPC endpoint with getRPCUrlSync … (sdk#271)

And with packages on different sections (simulated sdk@4.6.33 + wallets@4.8.24), the groups split correctly with each package showing its own notes.

Testing

• bun run tools/announce-release.ts --dry-run with the exact PUBLISHED_PACKAGES payload from run 27338881351 (output above) + a split-group scenario
• bun run tools/enrich-dep-changelogs.ts --dry-run still a clean no-op
• bun biome check clean

No changeset: tools-only change, no published package affected.