Add debug build flag and update nuitka

[Eeems]

Summary by CodeRabbit

• Chores
  • CI/CD now runs explicit debug and non-debug build variants and generates distinct debug artifacts and names.
  • Build and device pipelines propagate a debug flag so debug variants are produced consistently across platforms.
  • Build tooling upgraded (Nuitka bump) and build invocation flags added to enable debug-specific compilation options.
  • Build scripts refined for more consistent debug build invocation and artifact/report naming.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

Adds a debug matrix axis to CI workflows and threads a DEBUG_BUILD flag through the build script and Makefile, enabling conditional debug builds, debug-specific Nuitka flags, and debug-suffixed artifact naming.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflow Configuration /.github/workflows/main.yml	Introduces matrix.debug (0,1) for remote/device/remarkable jobs; job names append " (debug)" when matrix.debug==1; passes DEBUG_BUILD=${{ matrix.debug }} into build steps; debug artifact names include -debug.
Build System Makefile	Adds CODEXCTL_FLAGS variable conditioned on DEBUG_BUILD==1 (adds --debug --no-debug-c-warnings --no-debug-immortal-assumptions); injects $(CODEXCTL_FLAGS) into the Nuitka build invocation; updates Nuitka version from 2.7.12 to 2.8.10.
Build Script scripts/github-make-executable.sh	Forwards DEBUG_BUILD environment variable into the make invocation; minor here-string whitespace refactor (<<<"$line"); retains output parsing and log-level handling.

Sequence Diagram(s)

sequenceDiagram
  participant GH as GitHub Actions (matrix)
  participant Job as CI Job (remote/device)
  participant Script as scripts/github-make-executable.sh
  participant Make as Makefile / build
  participant Nuitka as Nuitka compiler
  participant Art as Artifact Upload

  rect rgba(220,230,250,0.5)
  GH->>Job: start job with matrix.debug (0 | 1)
  end

  Job->>Script: run script with DEBUG_BUILD=${matrix.debug}
  Script->>Make: invoke `make` with DEBUG_BUILD env
  Make->>Nuitka: add CODEXCTL_FLAGS when DEBUG_BUILD==1
  Nuitka-->>Make: produce executable and reports
  Make->>Art: upload artifacts (append `-debug` when DEBUG_BUILD==1)

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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main changes: adding a debug build flag (via CODEXCTL_FLAGS and DEBUG_BUILD) and upgrading Nuitka from 2.7.12 to 2.8.10.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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