[davidbudzynski]

Closes #93.

Change

• Add R_forceSymbols(dll, TRUE) in src/init.c.
• Use the registered symbols for clearData(), shareData() and getData() in R/call.R.
• No string .Call() lookups remain.

Test

• R CMD INSTALL passes.
• shareData() / getData() / clearData() round-trip passes.
• All tinytest expectations pass: 1599 results, all ok.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.76%. Comparing base (99413b6) to head (d2450b6).
⚠️ Report is 122 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #101      +/-   ##
==========================================
- Coverage   98.01%   96.76%   -1.25%     
==========================================
  Files          13       14       +1     
  Lines        5083     5137      +54     
==========================================
- Hits         4982     4971      -11     
- Misses        101      166      +65     

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