docs: enhance campaign orchestrator/worker architecture and add roadmap view guidance

[Copilot]

The campaign documentation lacked detailed explanation of the orchestrator/worker coordination model and didn't document how to use GitHub Projects roadmap views with custom date fields.

Orchestrator/Worker Architecture

Expanded the coordination section with three new subsections:

• The Coordination Pattern - Clarifies tracker-id mechanism for discovery
• Orchestrator Workflow Phases - Documents the four-phase execution model (Read State → Make Decisions → Write State → Report)
• Core Design Principles - Explains immutability, campaign-agnostic workers, external logic, single source of truth, and idempotency guarantees

Project Roadmap Views with Custom Date Fields

Added new section documenting how to use GitHub Projects roadmap views for timeline visualization:

• Setup process - Creating Start Date and End Date fields in Projects UI
• Orchestrator configuration - Setting date fields automatically via fields parameter:

update-project:
  project: "https://github.com/orgs/myorg/projects/42"
  item_url: "https://github.com/myorg/myrepo/issues/123"
  fields:
    status: "In Progress"
    start_date: "2025-12-19"
    end_date: "2025-12-26"

• Best practices - Field naming conventions, date assignment strategies for different work states, roadmap view benefits
• Example workflow - Complete campaign showing date field calculation based on issue size
• Limitations - Manual field creation requirement, case-sensitive naming, ISO 8601 date format, no auto-recalculation

Additional Changes

• Added custom date fields to "Recommended default wiring" list as optional primitive for timeline visualization

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• telemetry.astro.build
  • Triggering command: /opt/hostedtoolcache/node/24.12.0/x64/bin/node node /home/REDACTED/work/gh-aw/gh-aw/docs/node_modules/.bin/astro build (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Uodate campaign documentation to explain how it works now (orchestrator/workers) and consider adding custom fields to worked project items that define start and end date/time so we can make use of the project roadmap view.

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