feat(kb): record degree final grades and US 4.0 conversions

A Citadel application form asked for GPA and neither degree's
Abschlussnote existed anywhere in claims.json - only the M.Eng. thesis
grade. The single lead was an old CV extraction whose own provenance
note disclaims it and which already carries a known error, so it was not
safe to convert from. User confirmed both directly: M.Eng. 1.6 and
B.Eng. 2.4 on the German 1.0-4.0 scale.

US 4.0 equivalents recorded via the modified Bavarian formula, which
simplifies to 5.0 - G: 3.4 and 2.6. Both fields carry usage rules,
because a converted grade is easy to misuse. They are for application
forms and credential checks only, never to be presented as a natively
awarded GPA, and the German scale must always be stated alongside -
particularly for the bachelor, where the conversion makes a solid "gut"
read weaker to a US audience than it is.

Also flagged a percentile that does not agree with itself. The relative
grade is ECTS B, but this record said top 35%, the user said top 30%,
and ECTS B is formally the next 25% after the top 10%. Rather than pick
one, the field now says to check the certificate and notes that quoting
"ECTS grade B" alone is always safe. A specific percentile on an
application is exactly the kind of small number that a credential check
can contradict.

New grade_output_rule: neither grade belongs on a resume or in a cover
letter by default. Industry resumes omit grades, and the thesis 1.0 is
the only figure worth surfacing where academic performance is valued.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MHtzyTKBcg6BWhD5qFegtK

resume_builder/canonical/claims.json

@@ -32,8 +32,10 @@
       "end": "2013-10",
       "thesis_institution": "Tongji University, Shanghai",
       "thesis_title": "Development of a Web-Based Remote Fault Diagnosis System",
+      "final_grade": "1.6 (German scale, 1.0 best / 4.0 lowest pass) -- user-confirmed 2026-08-26",
+      "final_grade_us_4pt": "3.4 -- modified Bavarian formula, US = 1 + 3*(4.0-G)/(4.0-1.0), which simplifies to 5.0 - G. Use ONLY when a form demands a 4.0-scale GPA; always state the German scale alongside it. Never present as a natively-awarded GPA.",
       "thesis_grade": "1.0",
-      "thesis_relative_grade": "ECTS B (top 35%); official certificate on file",
+      "thesis_relative_grade": "ECTS B; official certificate on file. Percentile wording is unsettled: this record previously said top 35%, the user said top 30% on 2026-08-26, and ECTS B is formally 'the next 25% after the top 10%' (i.e. top 10-35%). CHECK THE CERTIFICATE before quoting a percentile; quoting 'ECTS grade B' alone is always safe.",
       "thesis_methods": "Verified against the thesis PDF 2026-08-02. Domain: vibration-based condition monitoring of CNC machine tools (piezoelectric accelerometers on spindle, tool rest, lathe body). Features: speed, load and the dimensionless waveform, peak, pulse, margin and kurtosis indices. Surveyed CBR, PSO, RBR and ANN; SELECTED a hybrid of rule-based reasoning (interpretable thresholds) plus a 7-10-3 feed-forward ANN (faultstates green/yellow/red) to handle noisy data that static rules cannot classify. Extensible plug-in architecture for swappable diagnosis methods and data collectors. Java/GWT client-server on MySQL. Evaluation measured throughput and latency, NOT model accuracy: the pipeline sustained ~500 samples/s against tri-axial vibration sensors delivering 72.9 kSPS, so the thesis concluded data reduction, filtering or batch scheduling is required for real-time use.",
       "thesis_limits": "PSO was SURVEYED ONLY and NOT used in the implementation -- never claim it as an applied method. No real operational data: training data came from a cited thesis, test data was modified plus a random generator. No model-accuracy figures exist. Back-propagation retraining was listed as future work, not implemented. Frame as a methods prototype/framework, never as a validated production predictive-maintenance system.",
       "transcripts_language": "English-language originals available for B.Eng. and M.Eng."
@@ -43,7 +45,10 @@
       "degree": "B.Eng. Information and Telecommunication Technologies",
       "institution": "Universitat der Bundeswehr Munchen",
       "start": "2009-10",
-      "end": "2012-10"
+      "end": "2012-10",
+      "final_grade": "2.4 (German scale, 1.0 best / 4.0 lowest pass) -- user-confirmed 2026-08-26",
+      "final_grade_us_4pt": "2.6 -- modified Bavarian formula (5.0 - G). Supply ONLY when a form requires a bachelor GPA; leave blank where optional. Always state the German scale alongside it, because the conversion makes German degrees read weaker to a US audience than they are: 2.4 is a solid 'gut'. Never present as a natively-awarded GPA.",
+      "grade_output_rule": "Neither degree grade goes on the resume or in a cover letter by default. Industry resumes omit grades; the M.Eng. thesis grade 1.0 is the only figure worth surfacing, and only where academic performance is genuinely valued. These fields exist for application-form GPA questions and credential checks."
     }
   ],
   "employment": [