refactor: rename root directories to tasks and runner

[robbycochran]

Summary

• rename the root workloads/ directory to tasks/
• rename the Go implementation directory from workflow/ to runner/
• update Go imports, build/release configuration, CI, tests, scripts, ignore rules, and documentation
• keep the repository name, harness executable, harness workflow commands, version 1 YAML schema, and reusable workflow interface unchanged

Stack

This PR stacks on #187 because the rename patch was prepared against #187's positioning and terminology changes. Merge #187 first, then retarget this PR to main.

External consumers that directly reference workloads/... or build/import ./workflow must update when adopting this revision. No compatibility symlinks or duplicate directories are introduced.

Validation

• PASS: supplied patch integrity, indexed application, whitespace check, and patch-ID equality
• PASS: no stale root workloads/ or workflow/ path references
• PASS: go build ./...
• PASS: go vet ./...
• PASS: CGO_ENABLED=0 go test ./...
• PASS: golangci-lint run ./...
• PASS: actionlint and shell syntax validation
• PASS: documentation/CLI command consistency
• PASS: make test-suite — 11/11 passed; live SDK lifecycle skipped without a gateway
• PASS: CI=true CONTAINER_CLI=docker make test-kind — 11/11 passed; provider capabilities skipped in CI mode
• SKIP: local CI/live integration — no local 127.0.0.1 gateway is registered
• SKIP: configured provider capabilities — no local provider environment was evaluated
• SKIP: OCP — KUBECONFIG is unset
• SKIP: managed HyperShell — HYPERSHELL_SA_ENV is unset

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