fix: preserve budget stops during generated planning

[seonghobae]

Change

• re-raise BudgetExceededError before generated-plan template fallback
• add a regression proving budget exhaustion does not invoke _plan

Parent

• stacked on fix: complete PR 765 review remediations #810

Validation

• pytest tests/test_generated_workflow.py tests/test_budget_enforcement.py (15 passed)
• python -m compileall -q contextual_orchestrator tests
• changed-test ruff --select F,E9
• git diff --check

This preserves the ADR 0014 hard budget stop and includes no credentials or real data.

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[seonghobae]

Maintainer exact-head audit: remote head 6e5e193, base 5379157. The PR tree is equivalent to the locally verified #810 follow-up tree: budget-stop re-raise plus regression coverage. Formal approvals are 0. Hosted checks are 17 total with 8 skipped and 9 queued, no failures. The equivalent local tree passed the full 1646-test suite, compileall, actionlint, diff-check, Semgrep, and pip-audit. Decision: WAIT_AND_REMEDIATE; no merge or bypass.

[devin-ai-integration]

Devin Review found 5 potential issues.