Implement RuntimeStatusService

[raphael-goetz]

Resolves: #127

[Copilot]

Pull request overview

Introduces runtime-status reporting for adapters by adding an Aquila runtime status gRPC client and wiring it into the base ServerRunner, with adapters now providing runtime metadata (features/configuration) at startup.

Changes:

• Add DracoRuntimeStatusService client to update adapter runtime status (NotReady/Running/Stopped) against Aquila.
• Extend ServerRunner::serve to accept RuntimeFeature and AdapterConfiguration vectors and trigger status updates during lifecycle.
• Update REST and Cron adapters to pass runtime features/configuration; REST adapter also changes expected header result shape to a struct/map.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
crates/base/src/runner.rs	Extends server lifecycle to publish runtime status updates and exposes server config getter.
crates/base/src/lib.rs	Exposes new client module from the base crate.
crates/base/src/client/mod.rs	Adds Aquila gRPC client with retrying channel creation and runtime status update helpers.
adapter/rest/src/main.rs	Passes runtime metadata into runner; adjusts flow header parsing to struct/map shape.
adapter/cron/src/main.rs	Passes runtime feature metadata into runner at startup.

Comments suppressed due to low confidence (1)

adapter/rest/src/main.rs:220

• The error message says "headers was not a list of header entries", but this code now expects headers to be a Struct (map) of string->string. Update the message to match the new expected shape to make debugging flow outputs easier.

            // headers struct
            let Value {
                kind:
                    Some(Kind::StructValue(Struct {
                        fields: header_fields,
                    })),
            } = headers_val
            else {
                return json_error(
                    StatusCode::INTERNAL_SERVER_ERROR,
                    "headers was not a list of header entries",
                );

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