feat: add menstrual cycle write methods

[TSHOGX]

Summary

• The library could already read menstrual dayview/calendar and pregnancy snapshots (Womens Health API Endpoints #193) but had no way to record a daily log, edit period dates, or run first-time cycle setup without going through Garmin Connect's UI.
• New methods mirror the current Connect web client. Daily-log and calendar POSTs were checked against live DI-token requests; calendar updates use cycleDatesLists + futureEditsByFE: true (not the old arrayOfCycles guess). Writes are full snapshots, not field-level merges: omitted lists/scalars clear, notes="" clears, omitted notes keep, and ovulationDay is always sent (omit == false).
• Enums are the REGULAR-cycle UI values only. NO_DISCHARGE is mutually exclusive with other discharge values. Pregnancy writes are out of scope.
• init_menstrual_cycle_setup / confirm_menstrual_period_start request shapes come from the frontend; they were not exercised live on an already-configured account (init would re-setup; confirm can turn a prediction into a real period).
• Demo write entries require typing YES. Supporting reads (lastconfirmed, summary, reports with 1/6/12 cycles) are available without that gate.

Test plan

• python -m pytest tests/test_garmin_unit.py::TestMenstrualCycle -q (15 passed)
• ruff check on the changed library/demo files
• Maintainer: optional live check of a daily-log snapshot write, then restore from a prior GET
• Maintainer: confirm demo write entries stay inert unless YES is typed

Summary by CodeRabbit

• New Features

  • Added menstrual health tracking support for cycle summaries, reports, confirmed cycles, daily logs, calendar updates, cycle setup, period-start confirmation, and tracking settings.
  • Expanded the interactive demo with menu options for viewing and updating menstrual data, including confirmation prompts for changes.
  • Added input validation for tracking details such as symptoms, moods, flow, notes, ovulation, dates, and report ranges.

• Documentation

  • Updated API and demo coverage information.
  • Clarified account-data modification warnings for menstrual write operations and calendar query limits.

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📥 Commits

Reviewing files that changed from the base of the PR and between d905fed and 8940fe0.

📒 Files selected for processing (3)

• demo.py
• garminconnect/__init__.py
• tests/test_garmin_unit.py

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Walkthrough

The Garmin client adds menstrual-cycle read and write methods, validation, profile handling, and endpoint support. The interactive demo exposes these operations with confirmation prompts. README coverage and unit tests are updated.

Changes

Menstrual cycle support

Layer / File(s)	Summary
API contracts and request helpers garminconnect/__init__.py	Adds menstrual enum validation, date-group validation, payload cleaning, endpoint URLs, UTC timestamps, and profile_id lifecycle handling.
Menstrual API operations garminconnect/__init__.py	Adds menstrual read methods and write methods for daily logs, calendars, cycle setup, period confirmation, and settings.
Interactive demo integration demo.py	Adds menu entries, input parsing, confirmation prompts, handlers, and dispatch wiring for menstrual operations.
Coverage documentation and validation README.md, tests/test_garmin_unit.py	Updates API coverage and account-data documentation. Adds tests for profile state, menstrual validation, request payloads, query parameters, and endpoint behavior.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Demo
  participant Garmin
  participant GarminMenstrualEndpoint
  Demo->>Garmin: Submit menstrual read or write request
  Garmin->>Garmin: Validate values and build payload
  Garmin->>GarminMenstrualEndpoint: Call menstrual endpoint
  GarminMenstrualEndpoint-->>Garmin: Return response
  Garmin-->>Demo: Display result or error

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Suggested reviewers: cyberjunky

Merge Risk: ⚪ Minimal · up to 8940f

The menstrual API additions include validation, payload construction, confirmation prompts, and targeted unit coverage. No remaining merge-blocking risk is established.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 41.56% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 77 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main change: adding menstrual cycle write methods. It is concise and directly matches the pull request objectives and changes.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@garminconnect/__init__.py`:
- Around line 4171-4173: Update update_menstrual_settings so the PUT always
receives a complete userMenstrualCycleSettings snapshot: fetch the current
menstrual settings and merge the caller’s values, or validate and reject
incomplete input before constructing payload. Preserve the existing
user_settings_id handling while ensuring partial pasted JSON cannot replace
omitted fields.

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📥 Commits

Reviewing files that changed from the base of the PR and between 54079fb and d905fed.

📒 Files selected for processing (4)

• README.md
• demo.py
• garminconnect/__init__.py
• tests/test_garmin_unit.py

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