feat(authoring): add atomic standard Skills lifecycle

[777genius]

Adds atomic skills init <name> [package-path] --description <text> and shared-profile skills validate [package-path] through both internal authoring entrypoints. Omitted paths bind exactly to the current directory. Creation stages and validates one generated Skill, publishes without replacement, preserves existing siblings and reports committed state even when a later check fails.

Follows merged #157 and #158. Based on main at 1b77dc8. Default public v1 behavior remains gated; this does not release v2 or enable deferred commands.

Validation at ce4eeb9:

• Integrated authoring and factory suites passed, including installer projection and template syntax probes. The pre-existing denied-parent test skips under root; it remains enforced by ordinary-user CI.
• The implementation run passed 22 native invocations through both actual binaries under calibrated Linux effect guards, plus focused race tests. Guards deny process/network/profile effects and restrict writes to the explicit init source and private scratch; they are not syscall traces.
• Both clean committed binaries now also passed the 22-case guarded journey with matching reports and generated trees. Build provenance records exact revision, vcs.modified=false and binary hashes. Independent xhigh review found no new P1/P2 after focused race tests, three additional fault probes and guard calibration. Final required CI, CodeQL, security, docs and Linux/Windows installer smoke passed. The draft bot review skip is not model review evidence. Native Windows/macOS execution and Phase 6 release remain separate gates.

The diff is approximately 1,800 lines including tests. Revert independently to remove the new Skills lifecycle while retaining package authoring and static readiness. An over-budget acquisition remains incomplete according to the existing bounded reader contract; uncaptured siblings are never reported as verified.

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