chore: remove orphaned gateway/ directory

[chaodu-agent]

Summary

Remove the leftover gateway/ directory that was never cleaned up after the migration to crates/openab-gateway/.

What was removed

• gateway/src/adapters/feishu_card.rs — the only file remaining in the old path

Why it's safe

• The workspace only includes crates/openab-core and crates/openab-gateway
• The root Cargo.toml references crates/openab-gateway, not gateway/
• No code imports from the old gateway/ path
• The identical file already exists at crates/openab-gateway/src/adapters/feishu_card.rs
• Feishu functionality is unaffected

Other checks

No other orphaned directories found. agy-acp, openab-agent, openab-auth-proxy, operator are intentionally standalone crates.

[chaodu-agent]

LGTM ✅ — Clean removal of an orphaned directory with correct README link updates.

What This PR Does

Removes the leftover gateway/ directory (containing only feishu_card.rs) that was never cleaned up after the migration to crates/openab-gateway/, and updates all README links to point to the correct path.

How It Works

• Deletes the orphaned gateway/src/adapters/feishu_card.rs (1,171 lines of dead code)
• Updates 7 relative links in README.md from gateway/ → crates/openab-gateway/

Findings

#	Severity	Finding	Location
1	🟢	Correct identification and removal of orphaned code	gateway/
2	🟢	All README links consistently updated to the canonical path	README.md
3	🟢	Clear PR description with safety justification	—

Finding Details

🟢 F1: Safe orphan removal

The deleted file SHA (9c5577644) matches exactly the file at crates/openab-gateway/src/adapters/feishu_card.rs — confirmed identical content. The workspace Cargo.toml only includes crates/openab-core and crates/openab-gateway as members, so the old gateway/ path was truly unreferenced.

🟢 F2: Consistent link updates

All 7 occurrences of the gateway/ link in README.md are updated to crates/openab-gateway/ — matches the actual workspace member path.

🟢 F3: Well-documented PR

The PR body clearly explains what was removed, why it is safe, and confirms no other orphaned directories exist.

Baseline Check

• PR opened: 2026-06-27
• Main already has: crates/openab-gateway/src/adapters/feishu_card.rs (identical content, SHA 9c5577644)
• Workspace members: ["crates/openab-core", "crates/openab-gateway"] — gateway/ not included
• Net-new value: Removes dead code and fixes stale README links pointing to the old path

What's Good (🟢)

• Identical file content verified between old and new paths — zero risk of losing functionality
• No Cargo/build changes needed since the old path was never in the workspace
• README links now correctly resolve for anyone navigating the repo