Docs: Update JavaScript programming documentation

[sensei-hacker]

User description

Summary

Updates JavaScript programming documentation to document new features added in INAV 9.0:

• PID controller output access (pid[0-3].output)
• Flight mode detection (flight.mode.poshold, flight.mode.rth, etc.)
• Updated sticky syntax to use variable assignment pattern
• Updated version history for INAV 9.0

Changes

• docs/javascript_programming/JAVASCRIPT_PROGRAMMING_GUIDE.md - Added flight mode and PID documentation, updated sticky examples
• docs/javascript_programming/api_definitions_summary.md - Updated PID and flight mode descriptions
• docs/javascript_programming/index.md - Added new features to language support list, updated version history

Testing

Documentation changes only - no code changes.

Related

Related to configurator PR #2470

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PR Type

Documentation

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Description

• Documents new INAV 9.0 JavaScript features: PID outputs and flight modes

• Adds Variables section covering let/const and ternary operators

• Updates API documentation to use explicit namespaced syntax

• Enhances code examples with practical use cases

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Diagram Walkthrough

flowchart LR
  A["JavaScript Guide"] --> B["Variables Section"]
  A --> C["Available Objects"]
  B --> D["Let/Const Variables"]
  B --> E["Ternary Operator"]
  C --> F["Flight Mode Detection"]
  C --> G["PID Controller Outputs"]
  D --> H["Compile-time Substitution"]
  E --> I["Conditional Values"]
  F --> J["inav.flight.mode.*"]
  G --> K["inav.pid[0-3].output"]

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File Walkthrough

Relevant files

Documentation

JAVASCRIPT_PROGRAMMING_GUIDE.md Add Variables section and expand API documentation              docs/javascript_programming/JAVASCRIPT_PROGRAMMING_GUIDE.md Adds new Variables section documenting let/const and ternary operators Expands Available Objects with detailed subsections for flight modes and PID outputs Provides practical code examples for flight mode detection and PID controller access Updates Tips section to use explicit namespaced syntax (inav.gvar, inav.events.edge) +85/-12  index.md Update feature list with new INAV 9.0 capabilities              docs/javascript_programming/index.md Updates feature list to highlight namespaced API access pattern Adds ternary operator to supported JavaScript features Documents flight mode detection and PID controller outputs Replaces destructuring example with explicit namespace syntax +6/-3

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