style(rmi-backend): complete lint cleanup — 1175→0 ruff errors

- Fix 71 invalid-syntax files (class-body newline-broken assignments)
- Add from/None chain to 307 B904 raise-without-from sites
- Add B008 ignore to ruff.toml (already in pyproject.toml)
- Noqa F401 on __init__.py re-exports (137 sites)
- Noqa E402 on deferred imports (63 sites)
- Bulk-add stdlib/FastAPI/project imports for F821 (127 sites)
- Replace ×→x, –→-, …→... in docstrings (4093 chars)
- Manual refactor of 5 SIM103/SIM116 patterns

Tests: 791 passed (66 deselected due to pre-existing Redis issues in test_rag.py)
Co-authored-by: opencode <opencode@rugmunch.io>

app/api/v1/public/__init__.py

@@ -1,4 +1,4 @@
-"""Public routes — no authentication required.
+"""Public routes - no authentication required.
 
 Target: scanner, wallet lookup, token info, pricing, health.
 """

app/api/v1/public/scanner.py

@@ -1,4 +1,4 @@
-"""Public scanner endpoints — /api/v1/scanner/*.
+"""Public scanner endpoints - /api/v1/scanner/*.
 
 Stub for unauthenticated token scans. Real implementation will
 trigger the scanner pipeline (honeypot detection, flash loan checks,
@@ -37,7 +37,7 @@ async def scan(req: ScanRequest) -> ScanResult:
     """Queue a token/wallet scan."""
     raise HTTPException(
         status_code=501,
-        detail="Scanner pipeline not yet wired — uses app.domain.scanner (T06+)",
+        detail="Scanner pipeline not yet wired - uses app.domain.scanner (T06+)",
     )
 
 
@@ -58,5 +58,5 @@ async def quick_scan(
     """Quick scan (free tier, no persistence)."""
     raise HTTPException(
         status_code=501,
-        detail="Quick scan uses cached shield — see caching_shield module",
+        detail="Quick scan uses cached shield - see caching_shield module",
     )

app/api/v1/public/token.py

@@ -1,4 +1,4 @@
-"""Public token endpoints — /api/v1/token/*.
+"""Public token endpoints - /api/v1/token/*.
 
 Stub for unauthenticated token queries. Real implementation will
 fetch token metadata, holders, liquidity, and risk score.
@@ -43,7 +43,7 @@ async def get_token(
     """Fetch basic token metadata."""
     raise HTTPException(
         status_code=501,
-        detail="Token lookup not yet implemented — coming in v5.1",
+        detail="Token lookup not yet implemented - coming in v5.1",
     )
 
 
@@ -52,7 +52,7 @@ async def get_token_risk(address: str, chain: str = "ethereum") -> TokenRisk:
     """Compute the risk score for a token (uses Bayesian reputation + on-chain checks)."""
     raise HTTPException(
         status_code=501,
-        detail="Token risk uses T01 Bayesian + T02 scanner pipeline — pending wiring",
+        detail="Token risk uses T01 Bayesian + T02 scanner pipeline - pending wiring",
     )
 
 
@@ -61,5 +61,5 @@ async def get_token_holders(address: str, chain: str = "ethereum", top: int = 50
     """Return top holders distribution for a token."""
     raise HTTPException(
         status_code=501,
-        detail="Holder distribution not yet implemented — uses Postgres + Neo4j",
+        detail="Holder distribution not yet implemented - uses Postgres + Neo4j",
     )

app/api/v1/public/wallet.py

@@ -1,4 +1,4 @@
-"""Public wallet endpoints — /api/v1/wallet/*.
+"""Public wallet endpoints - /api/v1/wallet/*.
 
 Stub for unauthenticated wallet queries. Real implementation will
 resolve wallets, fetch labels, and return balance/history data.
@@ -35,7 +35,7 @@ async def resolve_wallet(
     """
     raise HTTPException(
         status_code=501,
-        detail="Wallet resolution not yet implemented — coming in v5.1",
+        detail="Wallet resolution not yet implemented - coming in v5.1",
     )
 
 
@@ -44,7 +44,7 @@ async def get_wallet_labels(address: str, chain: str = "ethereum") -> list[dict[
     """Return labels for a wallet from all federated sources."""
     raise HTTPException(
         status_code=501,
-        detail="Federated labels API pending — see T11",
+        detail="Federated labels API pending - see T11",
     )
 
 
@@ -53,5 +53,5 @@ async def get_wallet_history(address: str, chain: str = "ethereum") -> dict[str,
     """Return transaction history summary for a wallet."""
     raise HTTPException(
         status_code=501,
-        detail="Wallet history pending — uses Neo4j + Postgres in v5.1",
+        detail="Wallet history pending - uses Neo4j + Postgres in v5.1",
     )