refactor: rename module to github.com/osapi-io/osapi

[retr0h]

Implements document-system-architecture tasks 2.1, 2.2, 3.4, and 3.5.

The module declared github.com/retr0h/osapi while the repository lives under osapi-io. This renames it and every import — 1,131 tracked files (1,080 Go, 24 YAML, 23 Markdown, 3 go.mod, 1 TypeScript).

Safe to rename

Task 2.1 asked whether anything outside the organization consumes the old path. Nothing does:

• GitHub code search for github.com/retr0h/osapi returns only this repository.
• pkg.go.dev reports "No known importers."

osapi-orchestrator is the only consumer, inside the org. It follows in a separate PR once this publishes — the sequencing the change calls for.

Two more homes the compiler could not check

Both added by osapi-io/specs#70 as tasks 3.4 and 3.5:

• docs/docusaurus.config.ts set organizationName: 'retr0h' three lines below url: 'https://osapi-io.github.io/'. The file contradicted itself and the site published anyway.
• contributing.md linked Discussions to retr0h/go-gilt — a different project, not a former owner.

Attribution is untouched: @retr0h as document author, NOTE(retr0h) comments, and the repos.json branch-protection entry all name a person.

Verification

• just test — passes, coverage 100.0% against the 99.9% target
• just build — passes
• Both nested example modules build; their replace directives point at the repository root and are unchanged
• No non-attribution retr0h reference remains outside docs/plans/

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@           Coverage Diff           @@
##             main     #446   +/-   ##
=======================================
  Coverage   99.94%   99.94%           
=======================================
  Files         484      484           
  Lines       24935    24935           
=======================================
  Hits        24921    24921           
  Misses         14       14           

Files with missing lines	Coverage Δ
internal/agent/agent.go	100.00% <ø> (ø)
internal/agent/condition.go	100.00% <ø> (ø)
internal/agent/consumer.go	100.00% <ø> (ø)
internal/agent/drain.go	100.00% <ø> (ø)
internal/agent/enrollment.go	100.00% <ø> (ø)
internal/agent/factref.go	100.00% <ø> (ø)
internal/agent/facts.go	100.00% <ø> (ø)
internal/agent/handler.go	100.00% <ø> (ø)
internal/agent/heartbeat.go	100.00% <ø> (ø)
internal/agent/identity/identity.go	100.00% <ø> (ø)
... and 33 more

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