feat(aws): implement phase 1C compute and network operations

[skyoo2003]

Summary

This PR implements Phase 1C: Compute & Network Integrations as outlined in the AWS Phase 1 full implementation plan.

Key Changes

1. Smithy Parser Protocol Detection (internal/codegen/parser.go):

   • Added support for aws.protocols#ec2Query, properly detecting and classifying the protocol as "ec2-query" instead of "".

2. Codegen CRUD Admission (internal/codegen/gen_crud_meta.go):

   • Admitted "ec2-query" in engineServable alongside query, rest-xml, rest-json, and json-*.
   • Updated codegen test to assert admission and verb classification for EC2 operations.

3. CRUD Engine EC2 Protocol Support (internal/shared/crud/crud.go, xml.go):

   • Defined protocolEC2Query = "ec2-query".
   • Updated Servable, NeedsBody, xmlProtocol, and Handle to parse URL/body form Action parameters and serialize to XML with text/xml Content-Type.
   • Updated encodeXML to generate the native EC2 XML envelope (<OperationResponse xmlns="http://ec2.amazonaws.com/doc/2016-11-15/"><requestId>...</requestId>) with <item> list element wrappers (per EC2 Query specification).
   • Added EC2 error envelope (<Response><Errors><Error><Code>...</Code><Message>...</Message></Error></Errors><RequestID>...</RequestID></Response>).

4. Gateway Router Integration (internal/gateway/router.go):

   • Updated extractOperationName to support ec2-query Action parameter extraction without consuming request body.
   • Added awsEC2QueryError envelope and text/xml Content-Type for ec2-query gateway error responses.

5. EC2 Provider Wiring (internal/services/ec2/provider.go):

   • Changed default case in HandleRequest from hardcoded NotImplemented XML error to return nil, plugin.ErrUnhandledOp.
   • Allows wiresCRUDEngine to detect wiring and enables seamless gateway fallback to the generic CRUD engine.

6. Manifest Regeneration & Coverage Impact:

   • Regenerated manifest_gen.go, registry_gen.go, and services.json.
   • EC2 unimplemented operations dropped from 691 to 193 (498 operations promoted to auto-crud).
   • Total global unimplemented baseline reduced from 3,009 to 2,511.
   • Updated published figures in docs/coverage.md and roadmap in docs/roadmap.md.

Verification

• go test ./internal/codegen/...: PASS
• go test ./internal/shared/crud/...: PASS
• go test ./internal/gateway/...: PASS
• go test ./internal/services/ec2/...: PASS
• go test ./cmd/devcloud/...: PASS (including published figure verification)
• Full go test ./internal/...: PASS (all 431 services pass)