Land release blocker fixes and workspace cleanup

docs/issues/llm-prompt-preflight.md

@@ -4,6 +4,25 @@
 **Path:** `crates/llm/src/lib.rs:143-166`, `:317-321`
 **Source:** [2026-04-22 code review](../code-review-2026-04-22.md)
 **Labels:** release-blocker, major, llm
+**Status:** RESOLVED (2026-04-22)
+
+## Resolution
+
+`LlmEngine::generate` still tokenises the whole prompt up front, but it
+now runs a dedicated prompt-budget preflight before creating the llama
+context. The chosen behaviour is an early typed failure rather than
+silent truncation:
+
+- If `prompt_tokens + max_tokens + 64 reserve tokens` exceeds the
+  8192-token cap, generation returns
+  `EngineError::PromptTooLong { prompt_tokens, max_tokens, available_prompt_tokens, context_window }`.
+- Prompts that fit exactly within the available budget still proceed and
+  allocate an 8192-token context as before.
+
+Regression tests:
+
+- `prompt_preflight_rejects_oversized_prompt_tokens`
+- `prompt_preflight_keeps_prompts_within_budget`
 
 ## Problem