Add Branch Convention community extension to catalog and README

[Quratulain-bilal]

Summary

• Adds branch-convention entry to extensions/catalog.community.json (alphabetically between
  azure-devops and canon)
• Adds Branch Convention row to README.md Community Extensions table (alphabetically between Azure DevOps Integration and Canon)

Extension Details

Field	Value
ID	branch-convention
Name	Branch Convention
Commands	3 (configure, validate, rename)
Hooks	1 (before_specify)
Category	process
Effect	Read+Write
Requires	spec-kit >= 0.4.0
Repository	https://github.com/Quratulain-bilal/spec-kit-branch-convention

What It Does

Configurable branch and folder naming conventions — addresses issue #407 (39+ upvotes), where the
maintainer explicitly said "We are going to separate Git branching and naming into an extension as an opt
in."

• /speckit.branch-convention.configure — Set up naming rules with built-in presets (default, gitflow,
  ticket, date) or custom patterns
• /speckit.branch-convention.validate — Check all branches and folders against the convention
  (read-only)
• /speckit.branch-convention.rename — Safely rename non-compliant branches and folders with preview and
  confirmation

Template tokens: {seq}, {kebab}, {ticket}, {date}, {type}, {summary}

Checklist

• Entry added to extensions/catalog.community.json in alphabetical order by ID
• Row added to README.md Community Extensions table in alphabetical order by name
• JSON validates successfully
• Extension repo has valid extension.yml, all command files, README, CHANGELOG, and LICENSE
• verified: false, downloads: 0, stars: 0 set for new submission
• Only 2 files modified (catalog + README)

Closes #407

[Copilot]

Pull request overview

Adds a new community extension (“Branch Convention”) to the project’s community extension discovery surfaces (the community catalog JSON and the README’s Community Extensions table), aligning with the request in issue #407 to make branch/folder naming configurable via an opt-in extension.

Changes:

• Added branch-convention metadata entry to extensions/catalog.community.json (alphabetically by ID).
• Added “Branch Convention” row to the README Community Extensions table (alphabetically by name).

Show a summary per file

File	Description
README.md	Adds the “Branch Convention” entry to the Community Extensions table with category/effect and repo link.
extensions/catalog.community.json	Registers branch-convention in the community catalog with metadata (URLs, requirements, provides, tags, stats).

Copilot's findings

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• Files reviewed: 2/2 changed files
• Comments generated: 0

[mnriem]

Thank you!