perf(jit): short function hot loop inline

[fffonion]

Summary

• add exact native trace exits, hot side-trace fusion, sparse region state, and direct tail-link handoff across same-frame and callable-frame traces
• carry inherited state across native links and rebuild linked trace entries directly from the restored active VM frame, removing redundant packet pointer traffic
• profile script call targets and inline bounded static leaf functions into SSA traces, including virtual-frame deoptimization and region SSA remapping
• lower hot scalar host calls and selected allocation, UTF-8, regex, and string operations through native helpers
• reduce callable-frame, interpreter dispatch, trace-exit, sparse restoration, and owned-value replacement overhead
• invalidate native trace owners and incoming links when set_local mutates callable identity
• require callable prototype proof for root, exit, and continuation trace inlining, while preserving runtime identity and schema guards
• explicitly track shared Borrow/BorrowMut source slots, including captures created by nested callables, and suppress native entry/inherited handoff only for affected frames while retaining native execution for private copied captures
• harden direct-link publication, interruption restoration, ownership/drop ordering, and link-generation invalidation
• reconstruct virtual inline frames for instruction/helper failures, preserve aliased mutation inputs, and enforce callable map-key parity
• validate complete inline-relevant callable state and keep synthetic schema guards out of fuel/epoch instruction accounting
• add JIT region/link/inline telemetry plus focused correctness and performance coverage

RustData sort performance

Criterion A/B against pd-vm 0.23.1, pinned to CPU 11; lower is better.

Mode	0.23.1	PR	Independent median delta	Paired median delta
JIT, latest 10-pair rerun	161.755 ms	153.165 ms	-5.31%	-5.31%
Interpreter, 5-pair extended rerun	257.260 ms	263.420 ms	+2.39%	-3.14%

Both modes meet the target by independent and paired medians. Absolute timings show host variance, so aggregate and paired medians are reported together.

Verification

• workspace tests with all features
• strict workspace Clippy with warnings denied
• AArch64 workspace check and Clippy
• focused ownership, deoptimization, callable identity/schema, shared-capture, region, direct-link, and invalidation tests
• all GitHub Actions checks on the latest HEAD

Three independent targeted read-only reviews approved the final HEAD 2267fa2 with no BLOCKING/HIGH findings.