Replace comment-based task binding with custom field integration

[Copilot]

Teamwork's UI locks comments to private and clears notification lists when comments are marked private. This breaks the reset comment workaround and affects manual comments added after automated ones.

Changes

New functions:

• teamwork::get_custom_field_id() - Looks up custom field ID by name using v3 API
• teamwork::update_task_custom_field() - Updates task custom field value via v1 API

Modified event handlers:

• pull_request_opened - Sets "PR" custom field to PR URL (was: private comment)
• pull_request_closed - Updates field with "(Merged)" or "(Closed)" suffix
• pull_request_review_submitted - Adds tags only (was: comment + tags)
• pull_request_review_dismissed - No action (was: comment)

Removed:

• teamwork::add_reset_comment() and all reset comment logic
• Comment generation for PR events
• Variables only used for comment formatting

Implementation notes

Custom field values properly escape JSON and URL-encode query parameters:

# Field lookup with URL encoding
local -r encoded_field_name=$(printf %s "$field_name" | jq -sRr @uri)
curl "$TEAMWORK_URI/projects/api/v3/customfields.json?searchTerm=$encoded_field_name"

# Update with safe JSON construction
local -r json_payload=$(jq -n \
  --arg field_value "$field_value" \
  --argjson custom_field_id "$custom_field_id" \
  '{"todo-item": {"customFields": [{"customFieldId": $custom_field_id, "value": $field_value}]}}')

Requires a custom field named "PR" to exist on tasks. Tags and board column movement unchanged.

Original prompt

Read the Teamwork API Docs: https://apidocs.teamwork.com/guides/teamwork/getting-started-with-the-teamwork-com-api

The current workflow doesn't work as we'd like it to. There's a UI state the locks the comments to private and having removed the people who should be notified of the comments. Adjust the implementation to bind the PR and the Task together in another way - maybe a custom field? One already exists on our tasks called "PR". However, this

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