[good first issue-platform adapt-OpenCode] Add durable TencentDB Agent Memory integration

[diqierjia]

Description

Adds a native OpenCode adapter for TencentDB Agent Memory with automatic L0/L1/Core/Skill recall, durable completed-turn capture, five native tools, fail-open behavior, and a source-first one-command installation flow that does not depend on an unpublished npm package.

Related Issue

Related to #926

Change Type

• New adapter
• Documentation
• Tests and CI

What is covered

• Official OpenCode tool() API and lifecycle hooks (chat.message, system transform, session.idle).
• ISO timestamps and current Memory Gateway v3 envelopes/isolation fields.
• Automatic cross-session L0 recall plus active conversation, atomic-memory, and Skill tools.
• Ordered user/text/tool-call/tool-result capture, including multiple queued completed turns.
• Durable per-pipeline outbox, cross-process filesystem claims, restart recovery, and repeated-idle deduplication.
• Timeout, configuration validation, sensitive-data redaction, untrusted-memory boundaries, and fail-open logging.
• English and Chinese user guides plus an OpenCode-readable self-install task.

Verification

Local deterministic checks:

npm run check       -> 9 files, 44 tests passed; typecheck and build passed
npm run e2e:local   -> nativeTools=5, capturedMessages=2,
                       repeatedIdleDeduplicated=true, crossSessionRecall=true
npm run pack:check  -> 54 files; source installer included
npm ls --depth=0    -> clean dependency tree
PowerShell parser   -> scripts/install-from-source.ps1 parsed successfully
git diff --check    -> passed

Isolated new-user acceptance on Windows:

OpenCode            1.18.18
Node.js             24.19.0
Gateway             http://127.0.0.1:18421 (isolated)
OpenCode host       http://127.0.0.1:18422 (isolated XDG config/data/state/cache)
SQLite              separate temporary data directory
Plugin load         passed after restart
L0 capture/search   passed across sessions
Automatic recall    passed in a new session without an explicit tool
L1 extraction       atomic count reached 1
L1 search           tdai_memory_search returned the extracted fact
Credential scan     0 retained occurrences
Cleanup             18421/18422 and temporary config/data removed; existing 18420 untouched

A redacted 15-second H.264 recording and sanitized logs are available for upload with the PR.

Self-test Checklist

• Code follows repository conventions and uses the MIT license.
• English and Chinese documentation are included.
• Unit, contract, package, and real-host isolated acceptance checks pass.
• No credentials or local test paths are committed.
• Temporary test processes and data were cleaned up.

Additional Notes

The documented installation path is source-based while the package remains unpublished. Users fill one ignored Gateway .env file, then give OpenCode the checked-in self-install instruction; the installer builds the adapter, starts the local Gateway, installs the private loader, and verifies health without copying model keys into OpenCode configuration.