docs: fix ado-script bundle count (thirteen → fifteen) and add trigger-e2e to AGENTS.md tree

[github-actions]

Agent Documentation Update

Findings

Area	Issue	File(s)
accuracy	docs/ado-script.md states the workspace "produces thirteen bundles" but actually lists (and the source directory contains) fifteen bundles: gate.js, import.js, exec-context-pr.js, exec-context-pr-synth.js, exec-context-manual.js, exec-context-pipeline.js, exec-context-ci-push.js, exec-context-workitem.js, exec-context-schedule.js, exec-context-pr-checks.js, exec-context-repo.js, conclusion.js, approval-summary.js, github-app-token.js, prepare-pr-base.js	docs/ado-script.md
structure	AGENTS.md architecture tree for scripts/ado-script/src/ was missing the trigger-e2e/ directory, which is already documented in docs/ado-script.md (lines 109–119 and 568)	AGENTS.md

Applied Fixes

• Changed "thirteen" → "fifteen" in the bundle-count sentence in docs/ado-script.md
• Added trigger-e2e/ entry (with brief description) to the scripts/ado-script/src/ tree in AGENTS.md

Notes

Verified by counting the bullet-pointed *.js entries in docs/ado-script.md (15 items) and by listing scripts/ado-script/src/ on disk (dirs: gate, import, 9× exec-context-*, conclusion, approval-summary, github-app-token, prepare-pr-base, executor-e2e, trigger-e2e, shared, __tests__). The trigger-e2e directory is already described in docs/ado-script.md; this change just adds it to the AGENTS.md architecture tree so agents navigating the tree see the full picture.

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