Address misc spec updates

[decentralgabe]

• add version number and controller property #102 add version number
• Add Implementation Guidance to Recommend Compressed Point Encoding #117 use compressed keys
• clarify language on kid handling #122 verification method id = jwk thumbprint

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 42.85714% with 36 lines in your changes are missing coverage. Please review.

Project coverage is 53.84%. Comparing base (e2db0ba) to head (044e474).

Files	Patch %	Lines
impl/internal/did/did.go	52.63%	13 Missing and 5 partials ⚠️
impl/internal/cli/store.go	0.00%	8 Missing ⚠️
impl/concurrencytest/main.go	0.00%	4 Missing ⚠️
impl/pkg/service/pkarr.go	70.00%	2 Missing and 1 partial ⚠️
impl/pkg/dht/dht.go	0.00%	2 Missing ⚠️
impl/internal/did/client.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #146      +/-   ##
==========================================
- Coverage   54.27%   53.84%   -0.43%     
==========================================
  Files          29       29              
  Lines        2119     2134      +15     
==========================================
- Hits         1150     1149       -1     
- Misses        862      873      +11     
- Partials      107      112       +5     

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