feat(proto): add examples to remaining schema fields

[cooper (czxtm)]

Summary

Brings every scalar field across the .proto.nix schemas up to full example coverage so the demo agent (and the planned proto-driven MSW handler generator) has enough material to synthesize mock data that feels like a real environment.

Coverage check after this change — every scalar field in every non-template schema now resolves to a withExample (or mkField { example = ... }):

$ for f in nix/stackpanel/db/schemas/*.proto.nix; do …; done
apps.proto.nix: 0 missing
aws.proto.nix: 0 missing
… (every schema)
users.proto.nix: 0 missing
variables.proto.nix: 0 missing

Files touched

• dns.proto.nix — TTLs, zones, records, proxied flags
• users.proto.nix — names, GitHub handles, emails, AGE keys
• secrets.proto.nix — legacy SecretsGroup SOPS/SSM/vals refs
• external/github-collaborators.proto.nix — login, id, role, SSH keys

The remaining 18 schemas (apps, aws, config, databases, deployment, extensions, files, healthchecks, modules, onboarding, scripts, services, shells, sst, step-ca, tasks, theme, variables) already had examples on every scalar field — verified by inspection.

Why this helps the demo

Examples flow through nix/stackpanel/db/lib/proto.nix → generated .proto // (example: …) comments → protobuf-ts JSDoc on TS types. The demo agent's MSW handler layer (apps/web/src/demo/handlers.ts) is on a path to be generated from these descriptors per apps/web/src/demo/README.md; once that lands, every field already has a sensible default mock value rather than "" / 0 / false.

Test plan

• ./packages/proto/generate.sh regenerates .proto files cleanly
• vp check (Nix eval + lint) passes
• Spot-check a generated .proto (e.g. dns.proto) to confirm // (example: …) comments appear on every scalar field
• Demo route (/demo) still boots without console errors

https://claude.ai/code/session_01HYhEk7cpz8hRS32Yo1TV9e

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Generated by Claude Code

[cursor]

PR Summary

Low Risk
Low risk: changes only annotate schema fields with example metadata and should not affect wire format or runtime behavior aside from generated comments/docs.

Overview
Adds missing proto.withExample annotations to remaining scalar fields in several Nix-backed protobuf schemas, including DNS (dns.proto.nix), users (users.proto.nix), legacy secrets group metadata (secrets.proto.nix), and generated GitHub collaborator metadata (external/github-collaborators.proto.nix).

These examples flow into generated .proto comments/JSDoc, improving mock/demo data generation without changing field numbers, types, or message structure.

^{Reviewed by Cursor Bugbot for commit f6e63a2. Configure here.}