test: add TypeScript SDK utility tests

[MD-Mushfiqur123]

Closes #406

Adds additional edge case tests to existing TypeScript SDK utility test files:

utils_pattern.test.ts (5 new tests):

• Empty pattern
• Empty value
• Multiple wildcards
• Dots and plus signs
• Wildcard prefix with suffix

utils_schema.test.ts (5 new tests):

• Nested zod objects with arrays and optionals
• Zod enums
• Non-object non-zod values
• Preserves $schema on plain objects
• Zod with default values

utils_http_agents.test.ts (2 new tests):

• httpAgent instanceof check
• httpsAgent instanceof check

cd sdk/typescript && npm run test:core -- tests/utils_*.test.ts
Tests  24 passed (24)

PR generated by AI agent.

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[github-actions]

Performance

SDK	Memory	Δ	Latency	Δ	Tests	Status
TS	345 B	-1%	2.42 µs	+21%	✓	✓

✓ No regressions detected

[github-actions]

📊 Coverage gate

Thresholds from .coverage-gate.toml: per-surface ≥ 86%, aggregate ≥ 88%, max per-surface regression ≤ 1.0 pp, max aggregate regression ≤ 0.50 pp.

Surface	Current	Baseline	Δ
control-plane	87.50%	87.30%	↑ +0.20 pp	🟡
sdk-go	92.10%	90.70%	↑ +1.40 pp	🟢
sdk-python	93.73%	93.63%	↑ +0.10 pp	🟢
sdk-typescript	92.84%	92.56%	↑ +0.28 pp	🟢
web-ui	89.93%	90.01%	↓ -0.08 pp	🟡
aggregate	89.03%	89.01%	↑ +0.02 pp	🟡

✅ Gate passed

No surface regressed past the allowed threshold and the aggregate stayed above the floor.

[github-actions]

📐 Patch coverage gate

Threshold: 80% on lines this PR touches vs origin/main (from .coverage-gate.toml:thresholds.min_patch).

Surface	Touched lines	Patch coverage	Status
control-plane	0	—	➖ no changes
sdk-go	0	—	➖ no changes
sdk-python	0	—	➖ no changes
sdk-typescript	0	—	➖ no changes
web-ui	0	—	➖ no changes

✅ Patch gate passed

Every surface whose lines were touched by this PR has patch coverage at or above the threshold.