chore: release 0.1.16

[jrob5756]

Summary

Release v0.1.16, bundling four merges since v0.1.15.

Changes since v0.1.15

Added

• feat(engine): resolve registry references in sub-workflow workflow: field #188 — type: workflow agents accept registry references (workflow[@registry][#ref]) in the workflow: field. Local files still take precedence; otherwise the value is parsed as a registry ref, fetched via the cache, and executed from the cached path. conductor validate recursively validates fetched sub-workflows with inode-based cycle detection and a depth cap of 10 (with a warning when truncated).
• feat: ship conductor as a Claude Code plugin marketplace #186 — Conductor now ships as a Claude Code plugin marketplace at the repo root. Install with /plugin marketplace add microsoft/conductor then /plugin install conductor@conductor. Markdown-only (no bin/, hooks, or MCP servers) so the trust surface stays minimal. The .claude/skills/conductor location was removed — the plugin is now the only home for the skill.

Changed

• docs(skill): refresh conductor skill with latest features #187 — Refreshed the bundled Conductor skill (SKILL.md + references) to cover show / replay / --metadata / --workspace-instructions, type: workflow, dialog mode, hooks, metadata, instructions, timeout_seconds, the openai-agents provider, corrected update behavior, registry #ref syntax, and unknown-fields-rejected validation.
• docs: rewrite 'Why Conductor?' with repeatable/deterministic/source-controlled framing #185 — Rewrote "Why Conductor?" around three pillars: repeatable execution, deterministic routing, version-controlled YAML.

Files changed

• pyproject.toml: 0.1.15 → 0.1.16
• CHANGELOG.md: new [0.1.16] section, Unreleased link bumped

Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com