perf: replace Go Loops sync with Bash

[danielkov]

Summary

Replace the Go Loops HTTP client and reconciler with a versioned Bash script that synchronizes the transactional email manifest directly through the Loops Content API using curl and jq. Keep the Go manifest validator for source-level contract tests and a small compatibility launcher for release automation that still invokes go run.

Motivation

The release path was compiling the server email dependency graph for an operation that ultimately consists of Loops API calls. The network reconciler does not need to be part of the Go codebase or rebuilt on each promotion.

Impact

The Bash script supports read-only ID resolution and full draft/update/Guardian/publish reconciliation while preserving mutation spacing, guarded retries, managed-name checks, and atomic ID output. The local email-ID setup task uses the script directly. Existing release automation remains compatible through a standard-library-only Go launcher, whose fresh-cache build completes in approximately three seconds.

Technical details

Manifest parsing and LMX validation remain in the email/loops Go package for CI contract tests; the deleted Go code is limited to HTTP transport and reconciliation. The compatibility launcher replaces itself with Bash so signals and exit codes propagate directly, and it can locate the script from the repository, server directory, or an explicit manifest path.

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[cubic-dev-ai]

All reported issues were addressed across 15 files

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[cubic-dev-ai]

All reported issues were addressed across 3 files (changes from recent commits).

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[cubic-dev-ai]

All reported issues were addressed across 12 files (changes from recent commits).

<sub>Requires human review: Auto-approval blocked because this review re-detected 1 unresolved issue already reported by Cubic.
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