feat(core): bind semantic node action targets to browser authority

[seonghobae]

Partial implementation of #28: an authority-bound semantic node action target derived from a validated observation.

Live dependency and exact head

• Protected main: 542ca1e9c0a863595b8b6697790005d2471f5413;
• prerequisite feat(core): add typed semantic node query contract #57 / feat/semantic-node-query: 52d0efafd292f2af5a38f747a10f7a7d80a86de9;
• this PR base: 52d0efafd292f2af5a38f747a10f7a7d80a86de9;
• this PR exact head: eb920427a4c46520118f29e38ab7fd4e944495d4.

The branch was non-destructively reconciled onto the live semantic-query parent. The final fix restores SemanticNodeActionTarget and SemanticNodeActionTargetError from the actual src/root.rs crate entry point; the existing action-target integration test had exposed the missing public export at compile time.

Exact-current verification

• local Rust 1.97.1 focused action-target tests: 7 passed;
• local locked workspace/all-features tests, strict Clippy, rustdoc, Python compileall, and 153 Python tests: passed;
• GitHub Rust contracts, Pinned Chrome for Testing MV3 fixture, and Production coverage: success for exact head eb920427a4c46520118f29e38ab7fd4e944495d4.

Boundary

This Draft remains a value-level prerequisite only. It does not execute browser input, authorize policy, mint capabilities, connect to BiDi/CDP/WebMCP, persist data, handle secrets, run models, or claim the #28 Chromium vertical slice. SemanticNodeActionTarget accepts only an action advertised by the observation and revalidates the exact live registry binding before later use; stale, retired, or caller-forged authority cannot be revived.

No independent counted approval is claimed. This scheduled maintenance actor does not self-approve, bypass required checks, alter workflows or rulesets, force-push, tag, release, or publish.

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