expect runtime error from taurus

[raphael-goetz]

Resolves: #196 & #197

[Copilot]

Pull request overview

This PR updates the REST adapter to stop assuming request bodies are protobuf-encoded Values and instead parse/encode bodies based on Content-Type, while also improving handling of non-HTTP “RuntimeError” results coming back from Taurus.

Changes:

• Parse incoming request bodies as JSON or text based on Content-Type (with a fallback path for missing Content-Type).
• Build a structured flow input containing request headers and optional payload, and detect/translate Taurus RuntimeError results to HTTP errors.
• Add helpers for mapping tucana::shared::Value results into hyper::Responses, including response-body encoding by Content-Type.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 7 comments.

File	Description
crates/base/src/store.rs	Clones and debug-logs flow input around execution requests.
adapter/rest/src/main.rs	Switches request-body handling to Content-Type parsing; wraps request headers/payload into input Value; adds RuntimeError detection; uses new response helpers.
adapter/rest/src/content_type.rs	New module to parse/encode bodies by Content-Type with unit tests.
adapter/rest/src/response.rs	New module to convert flow result Value into an HTTP response (status/headers/body).

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