Upgrade ruff to 0.16.7 and ty to 0.0.80

[davegaeddert]

Summary

• Bump ruff 0.16.6 → 0.16.7 and ty 0.0.78 → 0.0.80, refreshing uv.lock
• Raise the ty lower bound in pyproject.toml to >=0.0.80 (ruff stayed within its existing >=0.16.2,<0.17 constraint in plain-code/pyproject.toml, so no change was needed there)
• Fixed the two new redundant-condition diagnostics ty 0.0.80 surfaced by addressing their root cause rather than suppressing them:
  • plain-postgres/plain/postgres/preflight/models.py: known_lazy is documented to support mapping a key to None ("no error will be produced"), but its only current entry (field_error) made ty infer a non-Optional value type, so it flagged the later if error_fn else None check as always-truthy. Added an explicit dict[tuple[str, str], Callable[..., PreflightResult] | None] annotation to match the documented contract instead of silencing the check — this keeps the type checker validating a future None entry correctly.
  • plain-postgres/plain/postgres/sql/compiler.py: return_insert_columns() always returns a 2-tuple (str, tuple[Any, ...]), never None, so the outer if returning_cols: around it was genuinely dead (a non-empty tuple is always truthy) — the real "is it empty" check is the inner if r_sql: on the string. Removed the redundant outer check and reworded the now-inaccurate comment above it.

Checked both changelogs for anything else actionable:

• ruff 0.16.7: preview rule tweaks (new RUF077, RUF039/RUF055 re.prefixmatch recognition), bug fixes (format-spec quote handling, ISC003 unsafe-fix gating, TID254 multi-member import fix, D211/D203 messaging), no new stable-default rules fired against this codebase
• ty 0.0.79–0.0.80: new always-truthy/always-falsy (redundant-condition) diagnostics (the two fixed above), --force-exclude fix, metaclass/classmethod/tuple-variance/narrowing correctness fixes, Python 3.15 support declared — nothing else applicable here

Verification

• uv run ruff check . / uv run ruff format --check . — clean, no new findings
• uv run ty check . — clean after the two fixes above
• uv run plain-code check . --skip-oxc — ruff, ty, and annotation checks all pass (oxc binary download is blocked in this sandbox by an unrelated network-egress restriction — same limitation noted in Fix: oxlint/oxfmt binaries are fetched from github.com, unlike ruff/ty which resolve via PyPI #125)
• ./scripts/test (all packages) and ./scripts/test plain-postgres --server — all pass, including the affected plain-postgres package

Test plan

• uv run ruff check .
• uv run ruff format --check .
• uv run ty check .
• uv run plain-code check . --skip-oxc
• ./scripts/test (full workspace)
• ./scripts/test plain-postgres --server

🤖 Generated with Claude Code

https://claude.ai/code/session_01Ph4bQpiQJVJZx9cRkjBPAC

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Generated by Claude Code

[pullapprove5]

PASS: 1 review scope passed

	Scope	Progress
✅	code	1/1

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Next steps:

• @davegaeddert: Merge or close