Fix/update readme badges

[CKodidela]

Description

Remove the SonarQube badge from README.md and update the Coveralls badge to point to the correct repository and branch.

Related Issue

Fixes #531

Motivation and Context

The SonarQube badge is no longer maintained or relevant. The Coveralls badge URL needed to be corrected to use the canonical lowercase repository path (cameri/nostream) so the badge resolves properly.

How Has This Been Tested?

This is a docs-only change. No code was modified. Badge URLs were verified manually.

Screenshots (if appropriate):

N/A

Types of changes

• Non-functional change (docs, style, minor refactor)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my code changes.
• I added a changeset, or this is docs-only and I added an empty changeset.
• All new and existing tests passed.

[Copilot]

Pull request overview

This PR updates repository badges in README.md and expands subscription filter schema validation to accept uppercase single-letter tag query keys (e.g. #E, #K) alongside lowercase ones, with accompanying docs/tests.

Changes:

• Remove the Sonar badge and correct the Coveralls badge URLs to the canonical repo path.
• Update filterSchema validation to use isGenericTagQuery (supporting #A–#Z as well as #a–#z) and add unit tests.
• Document uppercase tag filter scope in CONFIGURATION.md and add a patch changeset.

Reviewed changes

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

Show a summary per file

File	Description
test/unit/schemas/filter-schema.spec.ts	Adds unit tests covering uppercase tag filter acceptance.
src/schemas/filter-schema.ts	Updates unknown-key validation to allow generic tag queries via isGenericTagQuery.
README.md	Removes Sonar badge and fixes Coveralls badge links.
CONFIGURATION.md	Updates index documentation and adds a section describing uppercase/lowercase tag filter scope.
.changeset/uppercase-tag-filters.md	Adds a patch changeset for uppercase tag filter support.

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[Copilot]

The PR metadata says this is a docs-only change focused on README badges, but this diff also includes behavior changes (filter schema validation) plus unit tests and a patch changeset. Please update the PR title/description/testing notes (and/or split into separate PRs) so reviewers and release notes match the actual scope.

[coveralls]

coverage: 73.153%. remained the same — CKodidela:fix/update-readme-badges into cameri:main