[doc] fix jsonrepair upstream link; clarify capability bits (LET-29)

[vt128]

What

Two documentation corrections:

1. jsonrepair upstream link. lib/json/README.md pointed repair's vendored jsonrepair at RealAlexandreAI/json-repair, but the actual vendored upstream is kaptinlin/jsonrepair v0.2.2 — confirmed by internal/jsonrepair/doc.go, its LICENSE (Copyright (c) 2024 KaptinLin), codecov.yml, and .codacy.yml. Fix the link to match.

2. Capability bits clarification. The ModuleCapability doc now states the bits model host effects (filesystem/network/process/log) only, not determinism/reproducibility. random is CapPure (no host side effects) yet non-deterministic by design; a consumer needing a "replayable / pure-function" set should define it on its own side (excluding entropy/clock sources such as random and time) rather than reading it off these bits.

Doc-only; no behavior change.

Requirement: LET-29

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Metrics 0 complexity · 0 duplication

Metric	Results
Complexity	0
Duplication	0

View in Codacy

🟢 Coverage ∅ diff coverage · +0.01% coverage variation

Metric	Results
Coverage variation	✅ +0.01% coverage variation (-1.00%)
Diff coverage	✅ ∅ diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (433eae0)	7692	7276	94.59%
Head commit (7f60e37)	7692 (+0)	7277 (+1)	94.60% (+0.01%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#168)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.41%. Comparing base (433eae0) to head (7f60e37).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #168      +/-   ##
==========================================
+ Coverage   93.39%   93.41%   +0.01%     
==========================================
  Files          49       49              
  Lines        6177     6177              
==========================================
+ Hits         5769     5770       +1     
+ Misses        260      258       -2     
- Partials      148      149       +1     

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