Document, improve visibility, and adjust campaign discovery budget limits

[Copilot]

Campaign run #21255054636 was a no-op because discovery exhausted its budget (3 pages, 50 items max) without finding matching items. This is expected behavior for campaigns with conservative governance, but lacked visibility and documentation.

Changes

Documentation (docs/campaign-discovery-budgets.md)

• Explains discovery budget mechanics (items vs pages)
• Documents 3-tier search strategy (campaign label → generic label → tracker-id)
• Provides guidance on when to adjust budgets
• Includes troubleshooting procedures for 0-item discoveries

Enhanced Discovery Logging (actions/setup/js/campaign_discovery.cjs)

// Now logs budget utilization
core.info(`Budget utilization: ${totalItemsScanned}/${maxDiscoveryItems} items, ${totalPagesScanned}/${maxDiscoveryPages} pages`);

// Warns on exhaustion with 0 items
if (budgetExhausted && allItems.length === 0) {
  core.warning(`Discovery budget exhausted with 0 items found. Consider increasing budget limits.`);
}

// Manifest includes exhaustion tracking
manifest.discovery = {
  budget_exhausted: true,
  exhausted_reason: "max_pages_reached",  // or "max_items_reached"
  ...
};

Adjusted Campaign Budget (.github/workflows/security-alert-burndown.campaign.md)

• Increased max-discovery-items-per-run from 50 to 100 (default level)
• Increased max-discovery-pages-per-run from 3 to 5 (moderate level)
• Allows discovery to scan up to 500 items (5 pages × 100/page)
• Maintains conservative pacing with max-new-items-per-run: 3

Impact: Campaign operators can now distinguish between true no-ops (no work available) and budget-limited runs (work may exist but wasn't discovered). The security-alert-burndown campaign now uses moderate budget levels that balance thorough discovery with controlled rollout pace.

Original prompt

Understsand why campaign run was noop and discovered no items:
https://github.com/githubnext/gh-aw/actions/runs/21255054636
Explain reached discovery budget limits.

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[mnkiefer]

@copilot Suggest a more reasonable budget.

[Copilot]

@copilot Suggest a more reasonable budget.

Updated to moderate budget levels (commit 85813b1):

• max-discovery-items-per-run: 50 → 100 (default)
• max-discovery-pages-per-run: 3 → 5 (moderate)

This scans up to 500 items (5 pages × 100/page) while keeping max-new-items-per-run: 3 for controlled rollout. Balances thorough discovery with pacing.