fix hr ceiling missing uneven-motion holds + stale doc cleanup

[abdulsaheel]

sessionHrCeiling was giving up on a start index right after checking the minimal duration-qualifying window's motion average, so a real held ceiling with motion concentrated at the edges (quiet middle) never got found. now it keeps extending the window (capped at 4x holdSeconds) until motion actually corroborates.

also cleaned up a few stale doc claims in README/ALGORITHMS: hardcoded test count (was 290, actually 624 passed / 6 skipped), workout family still mentioned explicit/retroactive detection that's deleted, and both docs still pointed at foundations/ppg_sqi.dart which doesn't exist anymore.

Summary by Sourcery

Improve session heart-rate ceiling detection for uneven-motion efforts and bring project documentation up to date.

Bug Fixes:

• Allow held heart-rate ceiling candidates to extend beyond the minimum qualifying duration until motion corroborates them, with a bounded search span.
• Stop evaluating a candidate once motion corroborates the sustained heart-rate ceiling or the maximum extension is reached.

Documentation:

• Update README and algorithm documentation to remove obsolete PPG signal-quality and explicit workout-detection references and reflect the current test totals.

[sourcery-ai]

Reviewer's Guide

Fix session HR ceiling detection for efforts whose corroborating motion is concentrated near the edges by extending each duration-qualified window up to a 4x hold-duration cap before rejecting it, while cleaning stale API references and updating documentation test counts.

Flow diagram for extended HR ceiling motion corroboration

flowchart TD
    A[Start candidate index] --> B[Extend window through samples]
    B --> C{Duration qualifies?}
    C -->|No| B
    C -->|Yes| D{Span exceeds 4x holdSeconds?}
    D -->|Yes| E[Reject candidate]
    D -->|No| F[Compute motion average]
    F --> G{Motion meets gate?}
    G -->|No| B
    G -->|Yes| H{Higher sustained HR than best?}
    H -->|Yes| I[Update HrCeiling]
    H -->|No| J[Stop this candidate]
    I --> J

Loading

File-Level Changes

Change	Details	Files
Extend candidate HR-hold windows until motion corroborates, while bounding the search span.	Allow motion-gate failures on the minimum qualifying duration to continue extending the same start index. Cap each candidate window at four times the requested hold duration to avoid unbounded scanning. Record the earliest motion-qualified window and retain the highest sustained HR ceiling across starts. Update complexity comments to reflect the bounded repeated scans.	lib/src/onehz/workout/observed_max_hr.dart
Remove stale documentation references to deleted APIs and correct repository test-count claims.	Remove the obsolete PPG signal-quality index from the foundations documentation. Remove deleted explicit workout detection from the algorithm table and describe automatic detection as non-explicit/non-retroactive. Replace the outdated test count with the current passed, skipped, and total counts.	ALGORITHMS.md README.md

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Review configuration:

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 6376c026-f5ac-4a22-9e2c-1c0469a3dc9d

📥 Commits

Reviewing files that changed from the base of the PR and between 187e026 and 0c1f73a.

📒 Files selected for processing (3)

• ALGORITHMS.md
• README.md
• lib/src/onehz/workout/observed_max_hr.dart

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Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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[abdulsaheel]

squashed into #59 for one clean review — closing this round.