docs: update for slog default backend and deprecations

[ankurs]

Summary

• Update Index.md structured logging feature to mention slog as the default backend
• Update Packages.md log description with slog default, deprecation notices for gokit/logrus, and slog bridge mention
• Add "Logging backends" section to howto/Log.md with backend comparison table, slog configuration example, slog bridge setup, and deprecation notice

Follows go-coldbrew/log#19 (slog backend + bridge, default switch).

Test plan

• Verify pages render correctly on the Jekyll site

Summary by CodeRabbit

• Documentation
  • Updated logging documentation to specify slog as the default backend
  • Added guidance on configuring and switching between logging backends
  • Documented the slog bridge for integrating third-party logging into ColdBrew's pipeline
  • Marked gokit and logrus backends as deprecated with migration guidance

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a885093a-32ad-4fda-a703-366406dc97ce

📥 Commits

Reviewing files that changed from the base of the PR and between fadd469 and 1ba9e6d.

📒 Files selected for processing (2)

• Packages.md
• howto/Log.md

📝 Walkthrough

Walkthrough

Documentation updates across three files establish slog as the default logging backend in ColdBrew, deprecate gokit and logrus backends, and provide configuration examples and migration guidance for third-party slog integration.

Changes

Cohort / File(s)	Summary
Logging Backend Documentation Updates Index.md, Packages.md, howto/Log.md	Updated feature and package descriptions to designate slog as the default logging backend. Added references to slog bridge for third-party integration, marked gokit and logrus as deprecated, and included practical configuration examples showing explicit backend setup and slog bridge routing.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 Hop along to slog we go,
Default backend steals the show,
Deprecated paths fade away,
ColdBrew's logging's here to stay! 🔍✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title accurately describes the main changes: updating documentation to reflect slog as the default backend and marking gokit/logrus as deprecated.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/slog-backend-update

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@Index.md`:
- Line 29: The table row under "Structured Logging" in Index.md is inconsistent
with other docs; update the backend list so go-kit and logrus are marked as
deprecated to match howto/Log.md and Packages.md. Edit the row that currently
lists "slog (default), zap, go-kit, logrus" and change the labels for the two
deprecated backends (for example "go-kit (deprecated)" and "logrus
(deprecated)") or append a footnote/parenthetical deprecation note, keeping
"slog" as the default and preserving trace ID/context wording.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: c4303b2c-3b8b-437f-85e4-1a9c9703e0d9

📥 Commits

Reviewing files that changed from the base of the PR and between fb73b97 and fadd469.

📒 Files selected for processing (3)

• Index.md
• Packages.md
• howto/Log.md

[Copilot]

Pull request overview

Updates the ColdBrew documentation to reflect slog as the default structured logging backend, and to document backend options plus deprecation status for older backends.

Changes:

• Add a new “Logging backends” section to the logging how-to, including a backend comparison table and slog configuration/bridge examples.
• Update the packages overview to describe slog as the default backend and call out deprecated backends plus the slog bridge.
• Update the home page feature table to mention slog as the default structured logging backend and add a reference link.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
howto/Log.md	Adds backend comparison + slog configuration and bridge documentation, plus a deprecation note.
Packages.md	Updates the logging package description to reflect slog default and bridge/deprecations.
Index.md	Updates the structured logging feature blurb and adds a slog link reference.

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