feat(#42): exclude agent-core-e2e from all CC surfaces with global filter#

Problem#

agent-core-e2e tasks, jobs, and events appeared on every page of the Control Center, cluttering views that operators primarily care about production pipelines.

Task / Link#

GitHub Issue AgentSDE/agent-core-control-center#42

Changes#

• Add lib/constants.ts with shared E2E_REPO, E2E_REPOS, and VIEWER_BASE constants (single source of truth)
• Extend JobFilters and EventFilters with excludeRepo and wire it into query builders
• Update app/pipeline/page.tsx and app/pipeline/[taskId]/page.tsx to import from shared constants instead of local duplicates
• Add excludeRepo: E2E_REPO default filter and "Show e2e" toggle to Jobs page
• Add excludeRepo: E2E_REPO default filter and "Show e2e" toggle to Events page
• Add excludeRepo: E2E_REPO to Agents page API calls with "Show e2e" toggle

Notes#

• Dashboard metrics are pre-aggregated server-side; excludeRepo filtering is not applied there (known gap per plan).
• excludeRepo on jobs/events API calls is additive — safe if the backend ignores unknown params.

Testing#

• Lint (npm run lint): ✅ no warnings or errors
• Build (npm run build): ✅ all 11 pages compiled successfully