docs: remove duplicated Board Operator entries from the docs navigation

[claudegoogl-sudo]

Follows CONTRIBUTING.md PR template — sections present: Thinking Path, Linked Issues or Issue Description, What Changed, Verification, Risks, Model Used, Checklist.

Thinking Path

• Paperclip is the open source app people use to manage AI agents for work
• The docs site's sidebar is generated from docs/docs.json (tabs → groups → pages)
• The Guides → Board Operator group listed execution-workspaces-and-runtime-services and delegation twice each, back-to-back, so the rendered sidebar shows duplicate links to the same pages
• This is a mechanical artifact of a list edit that appended without deduplicating; the pages themselves are correct
• Removing the two duplicate list entries restores one sidebar link per page; no content changes
• Documentation-nav hygiene only; zero product-code change

Linked Issues or Issue Description

No public issue tracks this; the defect is visible directly in the rendered sidebar (two identical entries under Guides → Board Operator).

What Changed

• docs/docs.json: deleted two duplicate page entries from the Board Operator group (guides/board-operator/execution-workspaces-and-runtime-services, guides/board-operator/delegation). Net diff: 2 deleted lines; JSON validity and all other entries unchanged.

Verification

• python3 -c duplicate-scan over all tabs/groups/pages: 2 duplicates before, 0 after.
• git diff --stat: exactly 2 deletions, no other churn (formatting round-trips byte-identically).
• CI runs the full verify matrix on this PR; the e2e shards render the app independently of docs nav, but the full lane still proves no generated-config consumer breaks.

Risks

• Minimal: a 2-line list deduplication in a generated-sidebar manifest. Worst case is a missing sidebar entry if a scan were wrong — the post-fix scan shows all 26 other Board Operator entries retained exactly once.

Model Used

GLM via the Anthropic-compatible Claude Code endpoint (z.ai). Agentic coding session with tool use and extended reasoning; the session does not expose the exact GLM version string.

Checklist

• I have included a thinking path that traces from project context to this change
• I have specified the model used (with version and capability details)
• I have checked ROADMAP.md and confirmed this PR does not duplicate planned core work (docs-nav hygiene only)
• I have searched GitHub for duplicate or related PRs and linked them above (none exist)
• I have either (a) linked existing issues with Fixes: # / Closes: # / Refs: # OR (b) described the issue in-PR following the relevant issue template (option b)
• I have not referenced internal/instance-local Paperclip issues or links (only public GitHub #NNN / github.com/claudegoogl-sudo/paperclip URLs)
• My branch name describes the change (docs/docs-nav-dedupe) and contains no internal Paperclip ticket id or instance-derived details
• I have run tests locally and they pass (duplicate scan: 0 remaining; JSON parses)
• I have added or updated tests where applicable (N/A — 2-line nav manifest fix)
• I have updated relevant documentation to reflect my changes (the sidebar manifest is the change)
• I have considered and documented any risks above
• All Paperclip CI gates are green (full verify matrix runs on this PR)
• [N/A] Greptile is 5/5 with no open P2s, recommendations, or follow-ups (Greptile reviews the upstream repo; this fork-internal PR has no Greptile integration)