docs: include grep and agent examples in extension publications

[AlexMikhalev]

The packaged VS Code and Continue READMEs now show how to search an editor-exported Risk/Concern graph with terraphim-grep, then capture an authored decision with terraphim-agent and read back its actual returned ID. They include Logseq-compatible synonyms:: Markdown, separate CLI installation instructions pinned to the tested v1.21.20 release, and the public search, memory and hooks walkthroughs. Future Continue release notes reference both tools.

The existing real MCP transport test now verifies reviewed graph replacement: the running process refuses changed bytes, and a restarted process admits the new graph digest and retrieves the added synonym. Actual CLI stdout, capture/readback JSON, binary hashes and command receipts are retained in .docs/marketplace-cli-examples-20261014/.

Validation:

• Both README shell examples executed against released macOS ARM64 clients 1.21.20: zero baseline hits becomes one Risk passage with the exported graph; both captures read back the exact content/tag/ID.
• All six Continue tests pass, including real SDK/CLI transport and the restart case.
• actionlint and git diff --check pass.
• UBS findings are recorded in static-checks.json: the existing environment-selected test executable is flagged twice; the two added JSON-decode warnings represent intentional fail-fast assertions on actual test output. No production runtime code changes.

Package versions remain unchanged. A subsequent versioned CI release and registry readback must carry these README bytes to Marketplace/Open VSX; merging this PR does not replace existing immutable packages.

Refs terraphim/terraphim-ai#3488 (Gitea).