[docs]: iteration 11 complete, replenish queue

[JamalLyons]

Summary

• Mark sprint iteration 11 complete: [docs]: expand phx-vm public API rustdoc #29 PHX-070-p7 function-name symbol stub (PR [bytecode]: section 5 function debug name stub (PHX-070-p7) #153), [phx-compiler]: expand rustdoc on compile, lib, and facade entry points #39 PHX-sched-8 AwaitIo stress harness (PR [vm]: multi-context AwaitIo stress harness (PHX-sched-8) #152)
• Update handoff trunk SHA to 61277991
• Replenish active queue to 8/8 with [compiler]: expand rustdoc on embed and standalone public APIs #42 PHX-070-p9 multi-module function name link merge test and [resolver]: expand Tier B rustdoc for scopes.rs #43 PHX-borrow-6 struct field overlapping mut borrow
• Sync ROADMAP.md and mvp-finish-todo.md for PHX-070-p7 and PHX-sched-8

Test plan

• Docs-only change — no code or test impact
• Active queue count is 8/8 with correct completed log entries

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