Add X-Incognia-Latency header with previous request latency

[alangalvino]

Summary

• send X-Incognia-Latency on API calls using the latency from the previous successful request
• keep the first request without the header and update the stored latency after each call
• add tests covering signup-to-signup, payment-to-feedback, and feedback-to-signup flows

[Copilot]

Pull request overview

Adds client-side tracking of the previous API call latency and sends it on subsequent Incognia API requests via the X-Incognia-Latency header.

Changes:

• Introduces latency measurement/state in IncogniaAPI and injects X-Incognia-Latency on requests after the first successful call.
• Routes existing API POST calls through a new internal __post wrapper to centralize header injection + timing.
• Adds unit tests for first-call/second-call and cross-endpoint sequencing, resetting the singleton per test.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
incognia/api.py	Adds latency tracking and a centralized POST wrapper that conditionally adds X-Incognia-Latency.
tests/test_api.py	Adds tests asserting presence/absence of the latency header across request flows and resets singleton state in setUp.

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[figueredo]

Deixando aprovado, mas vale ver as sugestão do Copilot

[Copilot]

Pull request overview

Adds client-side tracking of the last successful request duration and sends it on subsequent API calls via the X-Incognia-Latency header, with tests validating cross-endpoint flows and ensuring the first call omits the header.

Changes:

• Introduce a latency-tracking __post wrapper in IncogniaAPI that injects X-Incognia-Latency from the previous successful call.
• Route existing API methods through __post (including consistently passing params=None where applicable).
• Add unit tests for first-call behavior and for latency propagation across signup/payment/feedback sequences.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
incognia/api.py	Adds latency state + mutex and wraps POST requests to attach X-Incognia-Latency based on the previous call.
tests/test_api.py	Adds tests asserting header absence on first call and presence on subsequent calls; updates expectations to include params=None.

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