feat(gastown): integrate gastown into dev:env secret management

[IamCoder18]

Summary

Creates services/gastown/.dev.vars.example with @from annotations for NEXTAUTH_SECRET and GASTOWN_JWT_SECRET, enabling the dev:env sync system to generate .dev.vars and auto-create Secrets Store entries for Gastown locally.

Closes #4013

Previously Gastown hardcoded dev secrets in wrangler.jsonc env.dev.vars, which drifted from .env.local and couldn't benefit from the centralized secret management pipeline. The committed wrangler.jsonc already has correct secrets_store_secrets bindings in both top-level (production) and env.dev (local) sections, so no wrangler config changes are needed.

Verification

• Run pnpm dev:env and verify Gastown secrets are generated.

Visual Changes

N/A

Reviewer Notes

• The only file change is the new .dev.vars.example. The wrangler.jsonc already had correct secrets_store_secrets bindings in env.dev from a prior commit.
• GASTOWN_JWT_SECRET must be added to .env.local; otherwise the placeholder value from .dev.vars.example is used.
• Production deployment is completely unaffected. wrangler deploy uses top-level secrets_store_secrets bindings which are unchanged.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Single-file addition of services/gastown/.dev.vars.example is correct, consistent with repo conventions, and the @from annotations correctly wire into the existing dev:env secret management pipeline.

Files Reviewed (1 file)

• services/gastown/.dev.vars.example

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_{Reviewed by claude-4.6-sonnet-20260217 · 859,000 tokens}

_{Review guidance: REVIEW.md from base branch main}