feat: add iii-experiment worker

[rohitg00]

Summary

• Generic optimization loop with 7 functions
• Any target_function + any metric_function, minimize or maximize
• Not ML-specific: works on latency, code quality, prompts, configs, costs
• All through iii primitives: State, Streams, HTTP triggers
• 18 tests, 0 warnings

Functions

Function	Description
experiment::create	Define experiment with target, metric, direction, budget
experiment::propose	Generate parameter variations
experiment::run	Single iteration: propose, trigger, measure
experiment::decide	Compare score against best
experiment::loop	Run full budget of iterations
experiment::status	Current experiment state and history
experiment::stop	Halt running experiment

Test plan

• cargo test — 18 tests passing
• cargo check — 0 warnings

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 035432a5-7163-4b98-9c69-15b33dc20579

📥 Commits

Reviewing files that changed from the base of the PR and between e664259 and 28c5103.

📒 Files selected for processing (16)

• experiment/Cargo.toml
• experiment/README.md
• experiment/build.rs
• experiment/config.yaml
• experiment/src/config.rs
• experiment/src/functions/create.rs
• experiment/src/functions/decide.rs
• experiment/src/functions/loop_run.rs
• experiment/src/functions/mod.rs
• experiment/src/functions/propose.rs
• experiment/src/functions/run.rs
• experiment/src/functions/status.rs
• experiment/src/functions/stop.rs
• experiment/src/main.rs
• experiment/src/manifest.rs
• experiment/src/state.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/experiment

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[rohitg00]

Heads up — main is being bumped to iii-sdk =0.11.3 in #33. When that lands, please rebase and bump this worker's pin (currently 0.11.0) to =0.11.3. Two 0.11.x deltas that may bite:

• iii-sdk no longer exposes an otel cargo feature — OTel is always-on. Drop features = ["otel"] if you use it.
• WorkerMetadata gained an isolation field. If you construct it as a struct literal, add ..Default::default() (or fill the field). iii-lsp hit this; see the fix in chore: bump iii-sdk to 0.11.3 across all workers #33.
• register_function(msg, handler) (two-arg) is now register_function_with(msg, handler); register_function is single-arg via IntoFunctionRegistration. image-resize hit this; see chore: bump iii-sdk to 0.11.3 across all workers #33.

Release notes: https://github.com/iii-hq/iii/releases/tag/iii/v0.11.3