docs(site): document 7 new execution-context contributors

[github-actions]

Summary

• Closes a documentation gap introduced in v0.36.0 (PR feat(exec-context): add 7 trigger-context contributors with shared/ refactor #1019), where 7 new execution-context contributors shipped but were entirely undocumented in site/.
• The page previously described only the pr contributor and contained a placeholder note that future contributors would be added; it now documents all 8.

Changes

• site/src/content/docs/reference/execution-context.mdx
  • Contributors table — expanded from 1 row to 8 rows, with activation conditions and opt-in/opt-out defaults for each
  • Front-matter YAML example — expanded from 2 lines to a 22-line annotated example covering every contributor's key options
  • Fields reference — new per-contributor config keys: pr.checks.*, workitem.*, manual.*, pipeline.*, ci-push.*, schedule.*, repo.*
  • Agent-visible layout — new per-contributor aw-context/ directory trees for all 8 contributors, including the untrusted-sentinel note for workitem prose fields
  • Bash allow-list table — replaces the bare list with a table showing which commands each contributor adds
  • Compiler internals — updated from 3 source refs to 10 (one per contributor file)

Accuracy checks

• Every config field, default value, and activation condition verified against src/compile/types.rs (config structs) and the corresponding src/compile/extensions/exec_context/*.rs contributor source files
• Artifact file names verified against scripts/ado-script/src/exec-context-*/index.ts bundles
• Trust boundary and bearer-scope claims verified against workitem.rs, pipeline.rs, ci_push.rs, and schedule.rs — manual and repo confirmed bearer-free
• workitem untrusted-sentinel behavior verified in workitem.rs (wrapAgentReadableUntrusted)
• Bash allow-list extension sets verified per contributor in each *.rs file

Validation

• cd site && npm ci && npm run build — 35 pages built, all internal links valid

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