v0.13.0

[v0.13.0] - 2026-07-07

• Breaking: renamed the starter's placeholder project from my-project / my_project / My Project to piper / Piper. The console command is now uv run piper ..., the template package is piper/, pyproject.toml points at piper.cli:app, and the e2e extract-entities test file no longer carries the project placeholder in its name.
• Reworked /bootstrap for the single-token placeholder. It now derives distribution, package, and title forms from piper, applies context-aware replacements for command vs import/path positions, edits pyproject.toml by key, and aborts before writing if any placeholder tokens survive.
• Overhauled the README DevX. The quick start now explains uv run before the first command, shows real expected output, groups the demos around copy-pasteable commands, explains durable vs blocking execution, and adds Mermaid diagrams for hosted-run flow and execution modes.
• Added demo methods so the starter matches the JS starter. summarize-pdf summarizes a document (PDF) into { title, doc_type, key_points } and demonstrates a file input: piper/file_input.build_document_input() encodes a local file as a base64 data: URL wrapped in a Document envelope. generate-image generates an image from a text prompt and is the slow case that overruns the hosted ~30s blocking cap, making the durable-vs-blocking split concrete. Each is a self-contained "copy me" module under piper/examples/ with a matching main.mthds bundle and its own unit + e2e tests. Ships samples/sample-invoice.pdf to try summarize-pdf on.