feat(sync): add Composio shopify memory-sync pipeline

[CodeGhost21]

Summary

Adds a Composio memory-sync pipeline for the shopify toolkit — the tinycortex-side deliverable of #84. Connecting Shopify previously reported ACTIVE and then failed at sync with tinycortex sync does not support toolkit 'shopify'; this supplies the pipeline body so the slug becomes syncable.

ShopifySyncPipeline implements both SyncPipeline and IncrementalSource, modeled on the document-shaped Notion/Linear providers (a Shopify catalog is a set of stable, addressable records, not a message stream).

What it does

• Fetch — the product catalog via the Composio action SHOPIFY_GET_PRODUCTS ("Retrieves a list of products"). Products carry no customer PII, unlike orders — the cleaner memory source; orders can be a follow-up if wanted.
• Stable dedupe — each memory document is keyed on the stable numeric product id via the shared document() helper: document_id = "shopify:<product_id>", metadata.taint = "external_sync". Re-syncing an edited product upserts in place rather than duplicating — the stable-document_id lesson from openhuman#4953. The dedupe key folds in the modification time (<id>@<updated_at>) so edits re-ingest while the document id stays stable.
• Incremental — depth rides updated_at_min server-side (server_side_depth() = true); Shopify's cursor pagination page_info travels alone as the engine requires. Timestamps are normalized to UTC so the engine's lexical cursor comparisons order correctly regardless of the store's timezone offset.
• No PII/secrets logged — reuses the shared orchestrator's content-free tracing::debug! flow (toolkit + connection id only).

Registration

Registered exactly like the existing six pipelines: mod shopify; + pub use in providers/mod.rs, re-exported through composio/mod.rs and src/memory/sync/mod.rs.

Reference followed

src/memory/sync/composio/providers/notion.rs and linear.rs (document-shaped shape), against the IncrementalSource / run_incremental_sync contract in orchestrator.rs and the SyncPipeline / SkillDocument contracts in traits.rs.

Tests run

• cargo test --features sync --lib shopify — 7 new unit tests pass (toolkit/action slugs, extract_page on a sample Composio JSON payload, first-page vs cursor-page argument shaping, dedupe key, UTC sort-cursor normalization, stable document_id from document()).
• cargo test --features sync --test composio_sync_mock — 12 existing integration tests pass (no regressions).
• cargo fmt --all -- --check clean; cargo clippy --features sync clean. File is 342 lines (< 500).

Part of #84 (tinycortex pipeline body; openhuman wiring is the follow-up step)

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📥 Commits

Reviewing files that changed from the base of the PR and between 9a0603a and 4b57390.

📒 Files selected for processing (4)

• src/memory/sync/composio/mod.rs
• src/memory/sync/composio/providers/mod.rs
• src/memory/sync/composio/providers/shopify.rs
• src/memory/sync/mod.rs

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