[boxcee-interview]

Closes #562

Session sharing had no page in the 1.x docs, while the ttl field is referenced from "Controller identity" and "Operational considerations" on the assumption that one exists. This adds 1.x/agents/share-a-session.md (weight 60, after Human in the loop) covering the surface from the issue:

• the capability model: a share is a token that acts with the owner's access, not a grant to a named user
• READ_ONLY presented as a scope, with the insecure-mode caveat that it is not a security boundary in a default install
• ttl, expiresAt, and the config.sessions.shareMaxTtl cap, including rejection of a ttl above the cap
• spending a share via X-Share-Token, and revoking via RevokeSessionShare
• no CLI verb: gRPC and UI only

The cap is linked to the existing pages rather than restated.

How to Test

# in docs-site/
hugo mod get ./...
hugo --config hugo.yaml,hugo.preview.yaml -D --gc --minify
# -> HUGO_EXIT=0, no new ERROR/WARN lines (the single WARN is the pre-existing
#    `.Site.Data was deprecated` notice)
ls public/kagent/1.x/agents/share-a-session/index.html
# -> page renders; glossary term "Session" resolves; both linked anchors
#    (operational-considerations#expire-idle-sessions,
#     about/substrate-runtime/identity#controller-authentication-modes) exist

[boxcee-interview]

The deploy check failed in the Preview workflow: wrangler aborted with 'In a non-interactive environment, it's necessary to set a CLOUDFLARE_API_TOKEN environment variable' (job 122985167728). The change itself is a single docs markdown file, so the content/build checks all passed — this looks like a missing repo secret rather than something in the diff. A re-run (or restoring the secret) should clear it; no code change from me here.