* fix(blocks): move type coercions from tools.config.tool to tools.config.params
Number() coercions in tools.config.tool ran at serialization time before
variable resolution, destroying dynamic references like <block.result.count>
by converting them to NaN/null. Moved all coercions to tools.config.params
which runs at execution time after variables are resolved.
Fixed in 15 blocks: exa, arxiv, sentry, incidentio, wikipedia, ahrefs,
posthog, elasticsearch, dropbox, hunter, lemlist, spotify, youtube, grafana,
parallel. Also added mode: 'advanced' to optional exa fields.
Closes#3258
* fix(blocks): address PR review — move remaining param mutations from tool() to params()
- Moved field mappings from tool() to params() in grafana, posthog,
lemlist, spotify, dropbox (same dynamic reference bug)
- Fixed parallel.ts excerpts/full_content boolean logic
- Fixed parallel.ts search_queries empty case (must set undefined)
- Fixed elasticsearch.ts timeout not included when already ends with 's'
- Restored dropbox.ts tool() switch for proper default fallback
* fix(blocks): restore field renames to tool() for serialization-time validation
Field renames (e.g. personalApiKey→apiKey) must be in tool() because
validateRequiredFieldsBeforeExecution calls selectToolId()→tool() then
checks renamed field names on params. Only type coercions (Number(),
boolean) stay in params() to avoid destroying dynamic variable references.
