chore(release): bump workspace version to 0.2.7

Ships:
- structured PolicyCompileDiagnostic with errors/warnings on the
  PolicyCompileReport wire shape (axon-76469902)
- putSchema dry-run returns the report instead of bubbling; activation
  refuses on errors before persistence; REST/gRPC/UI clients see the
  report (axon-af905f5a)
- putSchema(input.explainInputs) evaluates fixture explain inputs
  against the proposed in-memory plan and returns dry_run_explanations
  (axon-81e1f28d)
- new /schemas Policy view-mode with editor, structured panels,
  fixture dry-run, and gated activation (axon-c3acde1f)
- e2e coverage in policy-authoring and intent-audit-lineage specs
  (axon-b087131a)

Follow-up: axon-414ea41d (actor override, self-target_policy resolver,
transition/rollback fixture support).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: easel

Cargo.toml

@@ -15,7 +15,7 @@ members = [
 resolver = "2"
 
 [workspace.package]
-version = "0.2.6"
+version = "0.2.7"
 edition = "2021"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/DocumentDrivenDX/axon"