docs: record the raised turn timeout and why

[EthanThatOneKid]

The live data-http service sets DATA_LETTA_TIMEOUT_MS=420000. A question that sends the agent through a tool loop took 4m26s on 2026-09-25 and tripped the 180s default, while a two-sentence question answered in 7.2s. Both docs now say so.

[wazoocomputer]

This pull request documents an increase in the DATA_LETTA_TIMEOUT_MS for the live data-http service to 420000 ms. This change was made because questions involving tool loops were exceeding the previous 180000 ms default, as demonstrated by a 4m26s query that timed out, contrasting with a simple question answered in 7.2s.

File	Change	Summary of Change
channels/http/README.md	modified	Updates the documentation for DATA_LETTA_TIMEOUT_MS to reflect the new default and its reasoning.
services/http-api.md	modified	Adds a historical note about the turn timeout increase and observations from testing different query types.

Reviewers should begin by examining the updated documentation in channels/http/README.md and services/http-api.md to ensure the information is accurate and clear.

[wazoocomputer]

This pull request documents an increase in the DATA_LETTA_TIMEOUT_MS for the live data-http service to 420000 ms. This change was made because questions involving tool loops were exceeding the previous 180000 ms default, as demonstrated by a 4m26s query that timed out, contrasting with a simple question answered in 7.2s.

File	Change	Summary of Change
channels/http/README.md	modified	Updates the documentation for DATA_LETTA_TIMEOUT_MS to reflect the new default and its reasoning.
services/http-api.md	modified	Adds a historical note about the turn timeout increase and observations from testing different query types.

Reviewers should begin by examining the updated documentation in channels/http/README.md and services/http-api.md to ensure the information is accurate and clear.