docs(flowpilot-migration): flag Phase 0.2 as pending-endpoint; target not yet built

The /tickets/ai-parse endpoint named in Phase 0.2 does not exist in the
codebase (verified: zero matches for ai-parse/ai_parse across endpoints,
services, models, and all branches/commit messages). integrations.py:557
is get_ticket_statuses — a CW passthrough with no AI call.

Adding a block-quoted note under the 0.2 deliverable that flags the
drift, records the cached-system-block pattern to apply when the endpoint
is built, and instructs the next editor to remove the note once applied.
No implementation change this commit — guidance only.

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

docs/FlowAssist_Migration/FLOWPILOT-MIGRATION.md

@@ -557,6 +557,21 @@ A codebase audit revealed that prompt caching is only implemented in `assistant_
 
 - **0.1** Promote `AnthropicProvider.generate_json()` and `generate_text_stream()` in `ai_provider.py` to the cached pattern currently implemented in `assistant_chat_service.py:_call_anthropic_cached()`. Convert the `system` string parameter to a structured system block list with `cache_control: {"type": "ephemeral"}` on the static portion. Add a second breakpoint on the last history message. For the streaming variant, capture the final usage object via `get_final_message()`. Log `cache_read_input_tokens` and `cache_creation_input_tokens` on every response.
 - **0.2** Update `integrations.py:557` (`/tickets/ai-parse`) to move the members list and team-stable boards data into a cached system block.
+
+  > **Phase 0.2 — pending target endpoint.** The `/tickets/ai-parse` endpoint described in the original migration doc does not exist in the codebase as of this commit. When this endpoint is built, apply the cached-system-block pattern:
+  >
+  > ```python
+  > system_blocks = [
+  >     {"type": "text", "text": members_json, "cache_control": {"type": "ephemeral"}},
+  >     # cacheable: team-stable
+  >     {"type": "text", "text": boards_json, "cache_control": {"type": "ephemeral"}},
+  >     # cacheable: team-stable
+  >     {"type": "text", "text": engineer_description},
+  >     # uncached: per-request
+  > ]
+  > ```
+  >
+  > Remove this note when the endpoint is implemented and the pattern applied.
 - **0.3** Add `cache_control` to one-shot generators: `ai_tree_generator`, `kb_conversion`, `ai_fix`, `script_builder`. Same pattern as 0.1.
 - **0.4** Extract the caching logic from `assistant_chat_service.py:_call_anthropic_cached()` into `AnthropicProvider` and delete `_call_anthropic_cached`. `assistant_chat_service` should call the provider like every other service. This prevents two canonical implementations of the same pattern.