Fix/ansi unicode tables

[jonathan-conder]

Description

Fixes #925. Still in draft because I need to work out what to do about my ansiterm fork.

Self-review quick check

• Make decisions that cost a lot to reverse explicit in the PR description.
• Avoid nested conditions.
• Delete dead code and redundant comments.
• Normalise symmetries by sticking to doing identical things identically.

// one way to handle errors
if err := f(); err != nil {
   ...
}

// one way to handle multiple returns
val, err := f()
if err != nil {
   ...
}
...

• Check that coupled code elements, files, and directories are adjacent. For example, test data is stored as close as possible to a test.
• Put variable declaration and initialisation together.
• Divide large expressions into digestable and self-explanatory ones. Use multiple variables if required.
• Put a blank line between two logically different chunks of code.
• Follow the style guide for new error messages.

Docs

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• I have checked and added or updated relevant documentation.
• I have checked and added or updated relevant release notes.
• I have included the technical author in the review.

Content:

• Headings and titles accurately describe the content.
• New and updated pages include correct metadata.
• Documentation tests are added or updated where applicable (for tutorial/ and how-to/ sections).
• Documentation follows the style guide.
• If needed, docs/.coverage.yaml updated, coverage tags added (.. artefact).

---

Or:

• I confirm the PR has no implications for documentation.

[Copilot]

Pull request overview

This PR addresses issue #925 (misaligned sdk find output when ANSI-colored Unicode publisher badges are present) by switching table formatting to an ANSI-aware tabwriter and updating several CLI table headers to use escape sequences safely.

Changes:

• Replace usage of the stdlib text/tabwriter with github.com/juju/ansiterm/tabwriter (using StripEscape) to keep column alignment correct with ANSI escapes.
• Update multiple CLI commands to render table headers with bold escapes without breaking alignment.
• Introduce a go.mod replace to a forked ansiterm version (to be finalized before merge).

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
go.mod	Adds github.com/juju/ansiterm and a replace to a forked module revision.
go.sum	Records checksums for the newly introduced dependencies (ansiterm fork + transitive deps).
docs/coding-style-guide.md	Updates the style guide example to use ansiterm/tabwriter.
cmd/workshop/tasks.go	Uses escape-aware bold header formatting for the tasks table.
cmd/workshop/sketch.go	Uses escape-aware bold header formatting for sketches table output.
cmd/workshop/list.go	Switches to ansiterm/tabwriter and bolds headers; defines ANSI-safe tabWriter().
cmd/workshop/info.go	Switches to ansiterm/tabwriter to keep escape handling consistent in output.
cmd/workshop/connections.go	Uses escape-aware bold header formatting for connections table output.
cmd/workshop/changes.go	Uses escape-aware bold header formatting for changes table output.
cmd/sdk/list.go	Switches to ansiterm/tabwriter and bolds the list header safely.
cmd/sdk/info.go	Switches to ansiterm/tabwriter and updates table templates to support bold header wrapping.
cmd/sdk/find.go	Switches to ansiterm/tabwriter and bolds headers; fixes alignment with colored publisher badges.
cmd/internal/cmdutil/util_test.go	Updates tests to import the ansiterm/tabwriter package.