Upgrade the Atomic harness to 0.9.24-alpha.1

The release keeps the same five builtin packages, so BUILTINS_OFF still
covers every one and the Planner session stays isolated to Chopin's host
tools.

Assistant-model: Claude Opus 5.5
Assistant-workflow: inline
Assistant-verification: bun test passed: 1688 pass, 2 PostgreSQL skips, 0 fail, including the atomic contract and isolation suites
Assistant-verification: bun run types passed: all workspaces and E2E
Assistant-verification: bun run ci passed: dprint, oxlint, tokens, type scale, Impeccable baseline
Assistant-verification: source check passed: @bastani/atomic 0.9.24-alpha.1 dist/builtin lists intercom, mcp, subagents, web-access, workflows, matching BUILTINS_OFF
Co-authored-by: Alex Lavaee <lavaman131@github.com>