fix(gts-id): return embedded UUID tails

[aviator5]

• Preserve explicit UUID tail segments in GtsId::to_uuid instead of deriving a namespace UUID.

Summary by CodeRabbit

• New Features

  • to_uuid() now preserves a UUID found at the end of an ID, returning that exact value when present.
  • IDs without a trailing UUID continue to use deterministic UUID generation.

• Chores

  • Updated the spec version to v0.12.2.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 55b7c762-2cf1-4bff-8813-a72bf7f24bc3

📥 Commits

Reviewing files that changed from the base of the PR and between f140043 and 9bcf8dd.

📒 Files selected for processing (2)

• .gts-spec-version
• gts-id/src/gts_id.rs

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📝 Walkthrough

Walkthrough

GtsId::to_uuid is modified to return an embedded UUID directly when the last segment contains one, instead of always deriving a UUID v5. Docs and two new tests reflect this behavior. The spec version is bumped to v0.12.2.

Changes

GtsId UUID tail passthrough

Layer / File(s)	Summary
to_uuid logic, docs, and tests gts-id/src/gts_id.rs, .gts-spec-version	Docs updated to describe the new passthrough rule; to_uuid returns early with the existing UUID when the last GtsIdSegment contains one; two new uuid-feature tests cover single-segment and chained-type UUID tail cases; spec version bumped to v0.12.2.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~5 minutes

Possibly related PRs

• GlobalTypeSystem/gts-rust#61: Introduced is_uuid_tail and trailing UUID detection, which is the parsing foundation that this PR's to_uuid passthrough logic depends on.

Suggested reviewers

• Artifizer

🐰 A UUID sat snug at the tail of an ID,
"No need to derive me," it cheerfully said.
The rabbit just peeked at the last little part,
Returned it directly — now that's pretty smart!
No v5 needed when the UUID's already there. 🎉

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: preserving embedded UUID tails in gts-id.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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