chore(spectra): archive embedded-dsl-spec-pattern-rule

Add 4 Requirements (classification gate, spec composition, tree notation,
cross-reference discoverability) to canonical openspec/specs/embedded-dsl-spec-pattern/.

Author: kiki830621

…ded-dsl-spec-pattern-rule/.openspec.yaml …ded-dsl-spec-pattern-rule/.openspec.yamlopenspec/changes/embedded-dsl-spec-pattern-rule/.openspec.yaml renamed to openspec/changes/archive/2026-05-06-embedded-dsl-spec-pattern-rule/.openspec.yaml openspec/changes/embedded-dsl-spec-pattern-rule/.openspec.yaml renamed to openspec/changes/archive/2026-05-06-embedded-dsl-spec-pattern-rule/.openspec.yaml

@@ -2,3 +2,5 @@ schema: spec-driven
 created: 2026-05-05
 created_by: che cheng <kiki830621@gmail.com>
 created_with: claude
+archived_by: che cheng <kiki830621@gmail.com>
+archived_at: 2026-05-06