Require Inkbox SDK 0.5.0

[alex-w-99]

Decisions

• Dependency floor: Require Python inkbox 0.5.0 while validating against exact source commit bcff3526d700c2be6546e7ebdbff60073a6ec7e0 until publication.
• Contact scope: Preserve the existing identity-scoped contact-access behavior; this PR does not change the contact contract.

Changes

• Raise the Inkbox SDK minimum to 0.5.0.
• Keep current contact-access tools, prompts, and documentation unchanged in behavior.
• Pin prerelease validation to the current public SDK source revision.

Verification

• 288 passed, 22 skipped.

Release Gate

Version 0.5.0 is not yet available from the package registry. After publication, rerun the normal registry-backed install.

Related

• 0.5.0: Identity tunnel summaries, tunnel ownership ids, inlined vault access inkbox#108
• Requires a coordinated backend rollout before release.