Migrate conductor.json to .conductor/settings.toml

[bokelley]

This PR migrates the legacy conductor.json configuration to the new .conductor/settings.toml format.

Generated by Conductor.

[aao-ipr-bot]

Straight config migration — conductor.json → .conductor/settings.toml, setup script moved verbatim. Dev tooling, not published, so no changeset owed and nothing on the wire changes.

Things I checked

• Setup script value is byte-identical between the old JSON and new TOML — same git fetch/rebase, same cp $CONDUCTOR_ROOT_PATH/.env ., same npm install → sync-schemas → generate-types sequence. Migration only, no behavior change.
• .npmignore:133-134 already ignores both conductor.json and .conductor/, so the new file stays out of the @adcp/sdk tarball. No published-package impact.
• No changeset required — CLAUDE.md:133 lists conductor.json explicitly under no-changeset dev tooling, and this touches nothing in src/lib/**, bin/**, or package.json's files field.
• Only other conductor.json reference is prose in CLAUDE.md's no-changeset list — not a blob/main/ link, so ci:doc-links is unaffected.

Minor nits (non-blocking)

1. Stale prose reference. CLAUDE.md:133 still names conductor.json in the no-changeset list. Harmless — the rule applies equally to .conductor/. Worth a one-word update next time that section is touched.

LGTM.