Prepare version 0.8.0 release

docs/releases/v0.8.0.md

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+# Notarius v0.8.0
+
+This release upgrades ConfigKit and PromptKit and makes provider retry behavior
+explicit, inspectable, and available in debug diagnostics.
+
+## Compatibility
+
+Configuration selection now uses `--config-overlay` and
+`overlays/<name>.yml`. The retired `--config-profile` flag and
+`profiles/<name>.yml` lookup are no longer accepted. PromptKit LLM profiles are
+unchanged.
+
+`promptkit.transient_retries` defaults to two additional eligible transient
+HTTP attempts per generation. Set it to `0` to disable built-in transient
+retries. Existing pipeline and validator retry settings remain separate.
+
+## Upgrade
+
+Move selected configuration files from `profiles/` to `overlays/` and replace
+every `--config-profile` invocation with `--config-overlay`. Review retry and
+timeout budgets before deployment, especially where providers charge per
+attempt. See [Configuration](../config.md), [Operations](../operations.md), and
+the [PromptKit integration contract](../integrations/pkg-promptkit.md).
+
+## Changes
+
+- Upgrade ConfigKit to v0.4.0 and PromptKit to v0.11.0.
+- Add application-owned generation failure and request-local execution-summary
+  metadata, including retry exhaustion details.
+- Record execution summaries in existing debug response artifacts and safe
+  per-call references.