[WIP] Update the DECOMPOSE_SYSTEM_PROMPT constant in packages/chat-api/src/lin

[bamdadd]

⚠️ This is a draft PR created by Lintel after a pipeline failure.
The automated workflow could not complete successfully. An engineer should review the changes, fix any issues, and mark the PR as ready.

Summary

Extend DECOMPOSE_SYSTEM_PROMPT in decomposer.py with four structured instruction sections (sizing constraint, requirement traceability, interface-first ordering, agent-readiness) and add a parametrized unit test asserting all four anchor phrases are present.

Changes

• Update DECOMPOSE_SYSTEM_PROMPT with four instruction sections
• Add unit tests asserting all four instruction phrases are present in DECOMPOSE_SYSTEM_PROMPT

Context

Update the DECOMPOSE_SYSTEM_PROMPT constant in packages/chat-api/src/lintel/chat_api/decomposer.py to include four explicit instruction sections: (1) sizing constraint — each work item must be implementable in a single PR touching max 3 files; (2) requirement traceability — every numbered point in the user input must map to at least one work item; (3) interface-first ordering — protocols and abstractions must appear before concrete implementations; (4) agent-readiness — descriptions must specify the target package, key files to create/modify, API routes, events to emit, and acceptance tests. Acceptance: the updated prompt is present in the file and a unit test asserts all four instruction keywords/phrases appear in the prompt string.

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Raised by Lintel 🤖

[bamdadd]

Closing stub PR — implement stage failed, will retry with fix.