chore : increase code coverage and testing

[felipegenef]

🚀 PR: Comprehensive Test Quality & Coverage Audit

This PR represents a major hardening of the Gothic CLI test suite. Beyond increasing raw coverage to >80% (effective), the focus was shifted to High-Signal Validation—ensuring that every test secures a real-world behavior and eliminates "silent failure" modes.

🔴 Critical Fixes (CI & Portability)

• Decoupled AST Scanner from Local FS: Removed all hardcoded absolute paths in pkg/helpers/wasm/astx. Test paths are now dynamically resolved using runtime.Caller, enabling seamless execution on any machine or CI runner.
• WASM Cache Invalidation Proof: Added end-to-end hash verification to ensure that updates to the CLI's embedded Runtime or Templates correctly flip the cache key. This guarantees users won't ship stale WASM binaries after a framework upgrade.

🟡 Logic & Security Hardening

• Infrastructure Assertions: Hardened AWS S3 deployment tests to assert full argv signatures. This prevents regressions where recursive flags or AWS profiles might be dropped, causing partial or mis-targeted deployments.
• Tailwind Reliability: Added a "Cache-Miss" download test for the Tailwind binary, ensuring the automated download and checksum verification logic works as intended on fresh installs.
• Proxy Resilience: Rewrote the Proxy RoundTripper tests to use real httptest blocking servers. This confirms the Exponential Backoff and Context Cancellation logic works against real networking timeouts, not just mock errors.

🟢 Quality & Maintenance

• Removed Tautological Tests: Deleted ~5 "placeholder" tests that were asserting Go's internal mechanics (like struct assignment or file writing) rather than framework logic.
• Standardized Checksums: Consolidated checksum parsing assertions into a single canonical suite in wasm_binary_test.go, removing duplication in the download helpers.
• Watch Loop Stability: Replaced flaky time.Sleep calls in the Hot Reload seam with a polling mechanism that waits for the debounce timer to arm. This eliminates "timing-flaky" false negatives in CI.

📊 Coverage Impact

• Effective Coverage: Recalculated at >80% (Project Target).
• Exclusions: Updated codecov.yml to ignore generated boilerplate (_templ.go), internal parity stubs, and static data templates, providing a more honest view of the CLI's logic health.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 81.81818% with 16 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/cli/cli.go	44.44%	5 Missing ⚠️
cmd/hotReload.go	82.60%	2 Missing and 2 partials ⚠️
cmd/init.go	55.55%	4 Missing ⚠️
pkg/helpers/templ.go	40.00%	3 Missing ⚠️

📢 Thoughts on this report? Let us know!