feat(sdk): CrewAI tool adapter (Engram as agent memory)

[jakerated-r]

What

Adds a CrewAI tool adapter for Engram, completing the agent-framework set the
LangChain (engram/sdk/langchain.py) and LlamaIndex (engram/sdk/llama_index.py)
adapters already cover. CONTRIBUTING.md lists "SDK examples for LangChain, LlamaIndex, agents"
as a high-impact area, and ROADMAP's good-first-issues call for "an agent example (LangChain, CrewAI, LlamaIndex)." — CrewAI was the missing one.

Changes (scoped to one reviewable PR)

• engram/sdk/crewai.py — EngramStoreTool and EngramSearchTool (CrewAI BaseTools) plus an engram_memory_tools() factory. Lets a CrewAI agent use an Engram miner as durable, semantic long-term memory (store facts in one task, recall them by meaning in another). Wraps the existing EngramClient (ingest / query) — no protocol changes.
• examples/crewai_agent_memory.py — runnable example wiring the tools into a CrewAI Agent/Crew, with a --tools-only path that needs no LLM/API key.
• scripts/test_crewai_sdk.py — offline-safe test in the style of scripts/test_sdk.py.

Design notes

• Lazy import, identical to the LangChain/LlamaIndex adapters: importing the module never hard-requires CrewAI; a helpful ImportError is raised only at tool construction if crewai is missing.
• Graceful degradation: when the miner is offline, _run returns an error string (what a CrewAI agent expects) rather than raising — so a missing miner doesn't crash a crew.

Verification

• python scripts/test_crewai_sdk.py — passes both with CrewAI installed (11/11: construction, names, args_schema, offline degradation) and without it (3/3: import + graceful ImportError).
• Tool logic verified against a pydantic-v2 BaseTool stand-in (CrewAI's BaseTool is a pydantic model).
• Honest limitation: end-to-end ingest/query against a live miner was not run in this environment (no local miner). The adapter calls the same EngramClient.ingest/query methods the LangChain adapter uses and that scripts/test_sdk.py already covers live; happy to add a live integration check or adjust to match a crewai-tools import path you prefer.

Keeps scope small per CONTRIBUTING; no unrelated formatting or refactors.

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