[flows-tinyflows] Catalog surface: drafts, suggestions and run reads #2

Moved from tinyhumansai#146, which is closed in favour of this issue. Part of tinyhumansai/openhuman#8055.

Extend the served Catalog surface with members the OpenHuman host still calls in-process:

• Drafts: Create/Get/Update/List/DeleteDraft (drivers catalog/drafts.rs; copilot ports::DraftStore), plus draft promote (create-or-update composition, host flows/ops/drafts.rs:69).
• Suggestions: Upsert/List/SetStatus (drivers catalog/suggestions.rs).
• Run reads: GetRun, ListRuns, ListAllRuns, PruneRuns.

Follow migrate-to-submodule (OpenHuman .claude/skills/): upstream PR → patch release → OpenHuman gitlink bump + registry digest re-pin. Design reference: docs/tinyflows-bus-design.md.

Done when: merged in tinyhumansai/tinyflows with wire tests for every new or changed contract type, released (patch), and the contract version bumped where a served shape changed. Gates: cargo fmt --all -- --check, cargo clippy --all-targets --all-features -- -D warnings, cargo test --all-features in tinyhumansai/tinyflows. OpenHuman adoption is a separate leaf of the epic.

Agent brief

• Files to consider (paths in tinyhumansai/tinyflows): crates/tinyflows-bus/src/catalog.rs, crates/tinyflows-module/src/
• Research: Host flows/draft_store.rs, ops/drafts.rs, ops/discovery.rs:129-160, ops/run_management.rs.
• Workflow: an implementing-an-epic step; follow migrate-to-submodule (upstream PR → patch release → OpenHuman gitlink bump + digest re-pin).
• Subagent: tdd-implementer.
• Dependencies: [flows-tinyflows] Catalog surface: serve workflow definitions, revisions and the CatalogStorage port (slice 2) #1.

Blocked by #1
Parent: tinyhumansai/openhuman#8055