feat: warn when ADR file scope is too broad

[rhuanbarreto]

Summary

• Add a performance diagnostic to resolveScopedFiles() that emits a logWarn() when an ADR's files glob resolves more than 1,000 files (SCOPE_FILE_WARN_THRESHOLD) or the glob scan takes longer than 2,000ms (SCOPE_SCAN_WARN_MS)
• The warning includes the ADR ID, file count, glob patterns, scan duration, and actionable advice to narrow the files patterns
• Update ARCH-005 (Testing Standards) with a new Do/Don't about wrapping spyOn calls in try/finally to prevent spy leaks when assertions fail

Test plan

• bun run validate passes (lint, typecheck, format, 1119 tests, 27/27 ADR checks, knip, build)
• New test: warns when file scope exceeds threshold (creates 1001 files, asserts warning fires with ADR ID, count, and suggestion)
• New test: does not warn when file scope is within threshold (10 files, asserts no warning)
• Manual: run archgate check on a large repo with a broad files: ["**/*"] ADR to confirm warning appears

[cloudflare-workers-and-pages]

Deploying archgate-cli with    Cloudflare Pages

Latest commit:	339cd3e
Status:	✅  Deploy successful!
Preview URL:	https://2d24c8cc.archgate-cli.pages.dev
Branch Preview URL:	https://feat-greedy-glob-warning.archgate-cli.pages.dev

View logs