docs: document TLS certificate auto-reload feature

[ankurs]

Summary

• config-reference.md: Added note under gRPC TLS table explaining automatic cert watching via certinel
• howto/production.md: Added paragraph about auto-reload working with cert-manager and Vault
• Index.md: Added "TLS with Auto-Reload" row to the features table

Accompanies go-coldbrew/core#82.

Test plan

• Verify pages render correctly on local Jekyll server

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3c01c94f-6b3e-4d23-8f0c-28d26cbb5725

📥 Commits

Reviewing files that changed from the base of the PR and between 286fb75 and ac9f410.

📒 Files selected for processing (3)

• Index.md
• config-reference.md
• howto/production.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/tls-cert-reload

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[Copilot]

Pull request overview

Documents ColdBrew’s gRPC TLS certificate auto-reload behavior across the docs site, so users know cert rotation can be handled without restarts (e.g., Kubernetes + cert-manager/Vault-style rotations).

Changes:

• Added a TLS section note in the production how-to describing automatic cert/key reload on file changes.
• Added a config-reference note under gRPC TLS explaining cert/key watching via certinel.
• Added a “TLS with Auto-Reload” entry to the homepage features table.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
howto/production.md	Adds operational guidance that TLS cert/key files are watched and reloaded automatically.
config-reference.md	Documents auto-reload behavior alongside gRPC TLS env vars, including the certinel implementation detail.
Index.md	Highlights TLS auto-reload as a first-class framework feature on the home page.

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