Upgrade ruff to 0.16.6 and ty to 0.0.78

[davegaeddert]

Summary

• Bump ruff 0.16.4 → 0.16.6 and ty 0.0.74 → 0.0.78, refreshing uv.lock
• Raise the ty lower bound in pyproject.toml to >=0.0.78 (ruff stayed within its existing >=0.16.2,<0.17 constraint, so no pyproject change was needed there)

Checked both changelogs for anything actionable:

• ruff 0.16.5/0.16.6: preview rule tweaks (pytest-fixture-autouse, PT020 autofix, TID254/TID255 fix-loop fix), bug fixes (B031 panic, RUF102, duplicate PT017 diagnostics), no new stable-default rules that fired against this codebase
• ty 0.0.75–0.0.78: new disjoint-cast diagnostic, deprecation reporting for intersection property accessors/implicit constructor calls/overloads, plus a batch of narrowing/inference/protocol correctness fixes

Verification

ruff check, ruff format --check, and ty check all pass clean against the whole workspace with the new versions — no new findings, so there was nothing to fix up (and nothing to remove) as part of this bump.

Note: this sandbox has no Docker/Postgres available, so ./scripts/test couldn't be run here. The change itself is scoped to the lockfile and one version constraint, verified via ruff/ty directly.

Test plan

• uv run ruff check . (plain's bundled config) — all checks passed
• uv run ruff format --check . (plain's bundled config) — all files already formatted
• uv run ty check . — all checks passed
• uv run plain-code check . --skip-oxc — ruff, ty, and annotation checks all pass
• ./scripts/test — not run; no Docker/Postgres in this environment

🤖 Generated with Claude Code

https://claude.ai/code/session_01R5KU4wBRARfY8VKiAMj1Gj

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Generated by Claude Code

[pullapprove5]

PASS: 1 review scope passed, 1 agent approved

	Scope	Progress
✅	code	1/1

✅ codex approved

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Next steps:

• @davegaeddert: Merge or close