Propagate canonical maintenance governance

[hindermath]

Summary

• synchronize the six canonical maintenance-governance files from Level 0
• align Intake Authoring Governance with v0.2.0
• preserve runtime, dependencies, and product behavior unchanged

Validation

• git diff --check
• repository secret scan
• PSScriptAnalyzer
• exact ten-preset profile check
• specify check
• all six files are byte-identical to Level-0 commit 9fb112696ea5a81eddff6dc3428d9ea69818e06b

Build and runtime tests were not triggered because this PR changes only governance templates and preset configuration.

The project statistics were deterministically re-rendered after the governance commit, as required by the repository homogeneity gate.

Exact-head fleet evidence

• Exact head: 27d333fd020a2d67a7d7609b05aa0df3f6683e60
• Local gates: diff, deterministic statistics, secret scan, PSScriptAnalyzer, ten-preset resolution, specify check, and Homogeneity all passed.
• Remote checks: all completed technical checks passed or were intentionally skipped by workflow design.
• Review audit: zero unresolved review threads and no actionable review comments.
• The narrow administrative bypass is permitted only for the documented provider-zero-step limitation and/or the remaining Human Approval rule.