docs: define concise argument context guidelines

[Seddryck]

Adds concise argument-context documentation guidelines to AGENTS.md and links them from the scaffold and implement skills. The guidance separates pipeline input from argument context, identifies source values precisely in nested calls, and recommends one or two sentences per distinct context with an example only when useful.

Validation: solution build passed with zero warnings or errors; both skills passed quick_validate.py; git diff --check passed. No runtime code changed.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.13%. Comparing base (efadad7) to head (8a52958).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #989   +/-   ##
=======================================
  Coverage   86.13%   86.13%           
=======================================
  Files         290      290           
  Lines        8964     8964           
  Branches     1657     1657           
=======================================
  Hits         7721     7721           
  Misses        792      792           
  Partials      451      451           

Flag	Coverage Δ
expressif-cli-net10.0	33.24% <ø> (ø)
expressif-net10.0	84.81% <ø> (ø)
expressif-net8.0	84.81% <ø> (ø)
expressif-net9.0	84.81% <ø> (ø)
expressif-serialization-net10.0	4.41% <ø> (ø)
expressif-serialization-net8.0	4.41% <ø> (ø)
expressif-serialization-net9.0	4.41% <ø> (ø)

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