fix(deploy,wallet,doctor): derive sequencer URL from [localnet] port

[wozos]

Description

logos-scaffold users on non-default localnet ports ([localnet] port = 14321 etc.) had three sites still hardcoding the default http://127.0.0.1:3040: deploy's sequencer fallback, is_connectivity_failure's substring needles, and doctor's wallet network-config check. The first stranded deploy against the wrong RPC when wallet_config.json omitted sequencer_addr; the second silently downgraded genuine functional failures (RPC rejection, signature mismatch) to transient connectivity warnings whenever the wallet echoed the URL in its error output; the third blindly substring-matched 127.0.0.1:3040 against the raw config text, so any non-default port produced a false Warn and a brittle whitespace match could swing the verdict either way. #40 established the port-config-respect invariant; this PR finishes propagating it.

Solution

• WalletRuntimeContext.sequencer_addr is now resolved once in load_wallet_runtime: wallet_config.json#sequencer_addr when present, otherwise http://127.0.0.1:<[localnet] port> (default 3040 if [localnet] is omitted, matching the existing LocalnetConfig::default). Field changes from Option<String> to String so call sites in deploy.rs and wallet.rs no longer carry their own copies of the fallback URL — both just clone wallet.sequencer_addr. DEFAULT_SEQUENCER_ADDR constant in deploy.rs is gone; the "http://127.0.0.1:3040" literal in wallet.rs is gone.
• is_connectivity_failure (src/commands/wallet_support.rs:226) drops the "127.0.0.1:3040" / "localhost:3040" needles. The remaining transport-error tokens (connection refused, tcp connect error, network is unreachable, etc.) cover the actual transport failure modes; the address literals were noise that caused two distinct false-positive shapes (non-default port loses the heuristic; functional failure echoing the URL gets misclassified).
• doctor's wallet-network-config check is now check_wallet_network_config in src/commands/doctor.rs. It parses wallet_config.json with serde_json, extracts sequencer_addr, and Passes iff the URL host is 127.0.0.1 or localhost and the port equals project.config.localnet.port. Missing sequencer_addr is also a Pass because the runtime falls back to the local URL; missing file / parse failure / non-string sequencer_addr / remote-host Warn with remediations that name the project's expected URL (not a hardcoded 3040). The URL-shape predicate (sequencer_addr_targets_local_port) is its own function for unit testability.
• 15 new tests cover: the retained transport-error tokens (positive), bare-URL and RPC-rejection shapes (negative), default URL derivation on 3040 and 14321, and every check_wallet_network_config branch (matching/mismatched port, localhost alias, missing field, missing file, malformed JSON, non-string value, remote host) plus the URL matcher.

cargo build and cargo test --all-targets both pass on the worktree (250 lib tests, 135 integration tests). cargo fmt clean. No new cargo clippy warnings on the touched files; pre-existing warnings in basecamp.rs are unchanged.

Notes

• Overlaps in scope with the still-open fix(wallet,deploy): default sequencer URL from scaffold localnet port #84 (fix(wallet,deploy): default sequencer URL from scaffold localnet port), which addresses only point (1). This PR is broader: it also covers (2) and (3), and centralizes resolution inside load_wallet_runtime rather than introducing a per-caller helper. Whichever lands first, the other should rebase against the resolved approach. The trade-off considered: leaving sequencer_addr as Option<String> with a default_sequencer_http_url_for_project helper (PR fix(wallet,deploy): default sequencer URL from scaffold localnet port #84's shape). Rejected because callers were already cloning, the field is always populated in practice, and the issue (Hardcoded port-3040 sites beyond #40 (deploy.rs DEFAULT_SEQUENCER_ADDR + 2 substring-match callsites) #118) explicitly preferred deriving it once in load_wallet_runtime.
• The change is intentionally orthogonal to PR fix(doctor): tighten localnet-connectivity heuristic to require transport-error + address #140's tightening of is_localnet_connectivity_failure in doctor.rs — different function, different concern. Both can land independently; the only contact is conceptual (both stop misusing the URL literal).
• The literal "127.0.0.1:3040" still appears in check_port_warn("sequencer port 3040", "127.0.0.1:3040", ...) (src/commands/doctor.rs:174). That callsite is what bug: doctor uses hardcoded port 3040 instead of configured localnet port #40 / PR fix(doctor): use configured localnet port instead of hardcoded 3040 #41 is rewriting — out of scope here.

Closes #118

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Run ID: 20260512-012013
Authored by: scaffold-wozos-issue-impl recurring task (claude-code worker)