docs: complete public docstring coverage

[seonghobae]

Summary

• Add the missing public docstrings in the telemetry ledger and HTTP request handler.
• No runtime behavior, API, authorization, or dependency changes.
• This closes the repository docstring quality gap from 95.8% to 100%.

Exact-head verification

• Head: 756d2a7
• Full pytest: 1435 passed in 538.77s
• Focused ledger/server tests: 22 passed
• interrogate: 100.0%
• compileall: passed
• actionlint: passed
• git diff --check: passed
• Semgrep Python and secrets: 0 findings; existing rule timeout warnings only
• pip-audit against requirements.lock: no known vulnerabilities

This is a normal protected PR. No bypass, direct protected-branch push, fake status, self-approval, or force push was used.

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 116f7cd5-9b8a-4d45-a7e2-3096828edaea

📥 Commits

Reviewing files that changed from the base of the PR and between 84a40cb and 11fa228.

📒 Files selected for processing (2)

• contextual_orchestrator/cost_ledger.py
• contextual_orchestrator/server.py

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[seonghobae]

Exact-head review update

• Exact head: 756d2a76bb91c0c65aac6c15bbab8270dd0ea479
• Exact base: e226e1197bdfc890c9d8e5b9b648c78857d7e465
• Scope: two files; public docstrings were added for the usage telemetry methods and HTTP handler methods.
• Exact-head interrogate: 100.0% (minimum 80%)
• compileall and git diff --check: passed
• Live hosted checks: 21 success, 8 skipped, 2 neutral; formal approvals: 0.

No source finding remains in the bounded documentation diff. Decision remains WAIT_AND_REMEDIATE until the protected required approval is present; no merge or bypass was performed.

[seonghobae]

Merge-gate evidence (2026-08-24)

All required checks green on current head except strix, which fails closed because the org's shared NVIDIA NIM key is returning litellm.RateLimitError (see runs 32646490187 / 32707494858: Nvidia_nimException - Error code 429 across primary and all fallback models, including the openai-direct fallback). Root cause + systemic fix (per-repository scan serialization): ContextualWisdomLab/.github#1297.

This is an external provider-capacity blocker, not a finding against this diff. Local evidence: full suite green on the rebased head; docstring additions are behavior-neutral (+12/-0).