revert-slack-channel-id

[spacecostsmoney]

Reverts #45

[Copilot]

Pull Request Overview

This PR reverts changes from PR #45, switching back from using Slack channel IDs to using channel names throughout the application.

• Reverts parameter and variable names from SlackChannelId to SlackChannel
• Updates default value from channel ID C03HVBJ7WKC to channel name si-sandbox
• Changes deployment configuration to use goals channel name instead of CF4U95FN0 channel ID

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/index.test.js	Updates test variables and environment setup to use slackChannel instead of slackChannelId
template.yaml	Reverts SAM template parameter from SlackChannelId to SlackChannel with name-based default
src/slack.js	Changes function parameter from channelId to channelName
src/slack-service.js	Updates function parameters to use channelName instead of channelId
src/index.js	Changes environment variable reference from SlackChannelId to SlackChannel
README.md	Updates documentation to reflect channel name usage and fixes capitalization
.github/workflows/deploy.yml	Updates deployment command to use channel name goals instead of ID CF4U95FN0

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