docs: post-Phase 6 audit (doc.go, README, rpc.go godoc)

[neverDefined]

Summary

Post-Phase 6 documentation sweep. No behavioral changes — godoc, README, and doc.go only.

Driven by parallel audits (godoc-polisher subagent + Explore agent) flagging concrete gaps after PRs #111, #112, #113 landed. Findings the audits reported as missing godoc on Variant.String / BIPID.String / SoftForkStatus.String were verified false (they already have godoc) and dropped.

Changed

doc.go

• Headline mentions Inquisition alongside Core.
• Configuration block documents the BinaryPath auto-detect chain (bitcoind-inquisition first, fallback to bitcoind) and the bitcoin-cli sibling-derivation fallback.
• New "Soft-fork Testing" section covers VBParams, MineUntilActive vs MineUntilActiveBIP, the curated BIPID registry, ListDeployments, the SupportsBIP skip-when-missing pattern, and Variant().
• Error Handling: corrected the "bitcoind not found" message; listed errNotConnected, ErrUnknownDeployment, ErrUnknownBIP as errors.Is-compatible sentinels.

README.md

• Tagline expanded to Core or Inquisition.
• Soft-fork section signposts MineUntilActiveBIP as the typed preferred form for Inquisition deployments.
• Fixed wrong description of ListDeployments — returns a []EnrichedDeployment sorted alphabetically by Deployment, not "keyed by deployment string."

rpc.go

• Filled out Parameters/Returns/Example godoc on Client, GetBlockCount, GetBlockCountContext, HealthCheck, HealthCheckContext to match the canonical voice (see MineUntilActive in mining.go).
• Documented errNotConnected and ctx.Err() paths so callers can errors.Is against them.

Test plan

• make ai-check green.
• go doc github.com/neverDefined/go-regtest reads cleanly with the new sections.
• No new exported symbols; no API changes; pure docs delta.

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