QVAC-17907 chore: adopt canonical model type names in SDK docs, examples, and tests

[arun-mani-j]

🎯 What problem does this PR solve?

• The public SDK surface still taught legacy alias model-type names ("llm", "whisper", "diffusion", ...) in the README, the loadModel reference docs, an example, and assorted tests. These aliases are deprecated (they log a warning and normalize to canonical), so teaching them weakens API clarity.

📝 How does it solve it?

• README quickstart now omits modelType entirely — it's inferred from the LLAMA_3_2_1B_INST_Q4_0 registry descriptor's engine — demonstrating the preferred descriptor-driven pattern.
• client/api/load-model.ts TSDoc (param doc + all @example blocks) uses canonical names and notes modelType may be omitted for registry descriptors. This TSDoc generates the published API reference.
• examples/diffusion-img2vid.ts: "diffusion" → "sdcpp-generation" (kept explicit since modelSrc can be a plain CLI path with no metadata).
• schemas/model-types.ts docstring leads with the canonical accessor and labels the alias as deprecated.
• Tests: migrated incidental alias usages to canonical across bci/vla/classification/sdcpp/profiler/inference-handler-migrations and the pr-body-bc-valid fixture. Left aliases only in the five tests that specifically verify the alias mechanism (accepts alias / resolves alias / rejects alias for plugins).
• No change to the alias mechanism itself or the deprecation warning — aliases remain accepted for backward compatibility. The registry addon search facet (a separate taxonomy incl. vad/other) is untouched.

🧪 How was it tested?

• bun run build — lint, typecheck, compile clean.
• bun run test:unit — all files pass.
• bun run test:bare — 43/43 tests, 207/207 asserts pass.

[github-actions]

QVAC E2E — android — ✅ all tests passed (86/98, 2896s)

Config: suite=smoke · filter=(none) · exclude=(none)
View run · Artifacts: reports · Device Farm logs

[github-actions]

QVAC E2E — windows — ✅ all tests passed (98/98, 428s)

Config: suite=smoke · filter=(none) · exclude=(none)
View run · Artifacts: reports

[github-actions]

QVAC E2E — linux — ✅ all tests passed (98/98, 256s)

Config: suite=smoke · filter=(none) · exclude=(none)
View run · Artifacts: reports

[github-actions]

QVAC E2E — macos — ✅ all tests passed (98/98, 273s)

Config: suite=smoke · filter=(none) · exclude=(none)
View run · Artifacts: reports

[github-actions]

QVAC E2E — ios — ✅ all tests passed (84/98, 955s)

Config: suite=smoke · filter=(none) · exclude=(none)
View run · Artifacts: reports · Device Farm logs

[arun-mani-j]

review

[github-actions]

Tier-based Approval Status

**PR Tier:** TIER1

**Current Status:** ✅ APPROVED

**Requirements:**
- 1 Team Member approval ✅ (1/1)
- 1 Team Lead OR Management approval ✅ (1/1)



---
*This comment is automatically updated when reviews change.*