fix: sync acp-providers.json with openhands-sdk ACP_PROVIDERS

[VascoSch92]

Summary

Fixes the failing validate-acp-providers check on #327.

scripts/check-acp-drift.py compares src/models/acp-providers.json against ACP_PROVIDERS in openhands-sdk (installed from software-agent-sdk@main). After the v1.41.0 SDK bump in #327, the upstream provider list had moved and this file's mirror was stale:

• Added the new claude-opus-5 model entry
• Dropped version numbers from Claude model labels (Claude Opus 4.8 (1M) → Claude Opus (1M), Claude Sonnet 4.6 → Claude Sonnet, Claude Haiku 4.5 → Claude Haiku)
• Bumped pinned @agentclientprotocol/claude-agent-acp from 0.44.0 to 0.63.0
• Bumped pinned @agentclientprotocol/codex-acp from 1.1.2 to 1.1.7

Test plan

• python scripts/check-acp-drift.py passes locally against openhands-sdk@main
• npx prettier --check src/models/acp-providers.json passes
• CI green on this branch (validates against the same SDK install CI uses)

[github-actions]

Endpoint audit

⚠️ 7 actionable Agent Server contract divergence(s) · report-only

Contract: pinned release artifact

Category	Count
Actionable client-only calls	0
Actionable server-only operations	7
Documented non-divergences	12
Agent Server contract operations	117
Audited handwritten client endpoints	118

Actionable client-only calls (0)

none

Actionable server-only operations (7)

• GET /api/conversations/{}/events
• GET /api/file/archive
• GET /api/git/commits
• GET /api/git/commits/{}/changes
• GET /api/init
• POST /api/conversations/{}/load_plugin
• POST /api/init

Documented non-divergences (12)

Client calls intentionally absent from the filtered contract (10)

• GET /
• GET /alive
• GET /health
• GET /ready
• GET /server_info

Reason: Operational Agent Server endpoints intentionally excluded from the filtered public release artifact.
Owner: OpenHands runtime maintainers

• DELETE /api/meta-profiles/{}
• GET /api/meta-profiles
• GET /api/meta-profiles/{}
• POST /api/meta-profiles/{}
• POST /api/meta-profiles/{}/activate

Reason: Client-ahead API stacked on the pending Agent Server meta-profiles implementation.
Owner: OpenHands SDK maintainers
Tracking: OpenHands/software-agent-sdk#3744

Server operations covered by an exposed browser URL (2)

• GET /api/conversations/{}/workspace
• GET /api/conversations/{}/workspace/{}

Reason: RemoteWorkspace.startWorkspaceSession exposes these authenticated URLs for browser iframe and file requests; they are not HttpClient method calls.
Owner: OpenHands TypeScript client maintainers