refactor: split oversized functions, fix double logging, add %w wrapping

- lsp/handlers_completion.go: extract buildNativeCompletionCacheKey and
  postProcessNativeCompletion; track collectFirstCompletion in inflight;
  remove redundant logLLMStats("") on error path
- lsp/handlers.go: extract checkTriggerFromContext and
  checkTriggerFromCursorChar; isTriggerEvent reduced from 63→10 lines
- lsp/transport.go: use %w for error wrapping in Content-Length parse
- llm/ollama.go: extract parseOllamaStream; ChatStream reduced to ~35 lines
- appconfig/config_load.go: extract decodeModelEntryFromMap; rename 'any'
  to 'found'; decodeModelEntry reduced to ~18 lines
- llm/provider.go: document why providerRegistry is package-level
- integrationtests/ask_test.go: add //go:build integration; move repoRoot
  init from init() to TestMain with diagnostic message

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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