chore(ci): remove codecov (#691)

Remove Codecov configuration and CI steps for uploading coverage/test
reports.

## Motivation and Context
- Codecov integration relies on third-party credentials
- Codecov has not demonstrated clear value for the project:
- Coverage analysis is already handled by kover, which runs locally and
in CI
- PR reviews still require manual inspection of tests regardless of
codecov reports
- Codecov flaky test detection is unreliable, it marks 3325 out of all
tests as flaky with similar failure rates, making the signal useless
(https://app.codecov.io/gh/modelcontextprotocol/kotlin-sdk/tests)

.github/workflows/build.yml

@@ -104,22 +104,6 @@ jobs:
           report_paths: '**/test-results/**/TEST-*.xml'
           truncate_stack_traces: false
 
-      - name: Upload coverage reports to Codecov
-        if: ${{ !cancelled() && matrix.os == 'ubuntu-latest' }}
-        uses: codecov/codecov-action@v6
-        with:
-          token: ${{ secrets.CODECOV_TOKEN }}
-          report_type: coverage
-          directory: ./build/reports/kover
-          files: report.xml
-
-      - name: Upload test results to Codecov
-        if: ${{ !cancelled() && matrix.os == 'ubuntu-latest' }}
-        uses: codecov/codecov-action@v6
-        with:
-          token: ${{ secrets.CODECOV_TOKEN }}
-          report_type: test_results
-
 
       - name: Archive Maven Local Repository
         if: ${{ success() && matrix.os == 'ubuntu-latest' }}

codecov.yml

@@ -1,51 +0,0 @@
-# Codecov configuration for Mokksy and AI-Mocks
-# https://docs.codecov.com/docs/codecov-yaml
-
-codecov:
-  require_ci_to_pass: yes
-
-coverage:
-  precision: 2
-  round: down
-  status:
-    project:
-      default:
-        target: auto
-        threshold: 1%
-    patch:
-      default:
-        target: auto
-        threshold: 1%
-
-comment:
-  layout: "header, diff, flags, components"
-  behavior: default
-  require_changes: true
-
-component_management:
-  default_rules:
-    statuses:
-      - type: project
-        target: auto
-  individual_components:
-
-    - component_id: kotlin-sdk-core
-      name: SDK Core
-      paths:
-        - kotlin-sdk-core/**
-
-    - component_id: kotlin-sdk-client
-      name: SDK Client
-      paths:
-        - kotlin-sdk-client/**
-
-    - component_id: kotlin-sdk-server
-      name: SDK Server
-      paths:
-        - kotlin-sdk-server/**
-
-    - component_id: kotlin-sdk-testing
-      name: SDK Testing
-      paths:
-        - kotlin-sdk-testing/**
-

context7.json

@@ -12,7 +12,6 @@
     "CONTRIBUTING.md",
     "LICENSE",
     "SECURITY.md",
-    "codecov.yml",
     "gradlew",
     "gradlew.bat",
     ".editorconfig",