feat(payment): add manager and connector mutations

[aidandaly24]

Description

Second CUD layer of the payment stack, following identity-provider mutations in #2277.
Session/instrument mutations follow in #2281.

Adds:

• payment manager create|update|delete
• payment connector create|update|delete

Includes existing default IAM service-role provisioning, ownership/collision
protections, Coinbase Quick Create, provider name/vendor resolution, and
authorization follow-up hints. Supplied/unowned roles are not modified, and
manager deletion does not delete IAM roles.

Session and instrument commands remain read-only in this layer, including balance.
The later data-plane layer adds their mutations. Code and tests are moved from
the original CUD implementation without changing these behaviors.

Updated against refactor at 4a235162. Quick Create/provider alternatives now
use the shared assertMutuallyExclusiveFlags helper from #2263; the rule is
unchanged and its error wording follows the shared standard.

Related Issue

Part of #2272.

Documentation PR

N/A. README documents manager creation, Quick Create, provider-backed connectors,
and IAM ownership.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Other (please describe):

Testing

• RECORD=0 bun test: 3,344 passed across 234 files.

• bun run typecheck, bun run lint:check, bun run format:check

• bun run build, bun run secrets:check

• Command tree, Core interface, and test stubs contain manager/connector mutations only.

• IAM and payment Core remain unchanged; existing source-exclusivity assertions use the shared messages.

• Linux, Windows, and macOS CI on c537d6e9: https://github.com/aws/agentcore-cli/actions/runs/34625567618

Uses the repository's Bun scripts rather than the npm scripts from the main-branch template.
No AWS resources were changed or live mutation fixtures re-recorded.

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

PR #2277 is the outstanding dependency.

---

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the
terms of your choice.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 97.56469% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.17%. Comparing base (d7cd656) to head (c537d6e).

Files with missing lines	Patch %	Lines
src/handlers/payment/connector/delete/index.tsx	88.23%	4 Missing ⚠️
src/handlers/payment/connector/update/index.tsx	90.47%	4 Missing ⚠️
src/core/roleRetry.ts	86.66%	2 Missing ⚠️
src/handlers/payment/connector/create/index.tsx	97.59%	2 Missing ⚠️
src/core/paymentServiceRole.ts	99.06%	1 Missing ⚠️
src/handlers/payment/manager/create/index.tsx	98.68%	1 Missing ⚠️
src/handlers/payment/manager/delete/index.tsx	96.29%	1 Missing ⚠️
src/handlers/payment/manager/update/index.tsx	98.30%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           feat/payment-cud    #2280    +/-   ##
==================================================
  Coverage             97.17%   97.17%            
==================================================
  Files                   591      599     +8     
  Lines                 40172    40808   +636     
==================================================
+ Hits                  39036    39656   +620     
- Misses                 1136     1152    +16     

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