[gobby-cli-#467] feat: echo all five research budget limits in JSON

gwiki research --format json echoed only max_steps/max_tokens/max_sources;
the spec requires every enforced budget to be visible. Promote the
hardcoded 900s wall-time / 24000-byte note budgets to named constants
(RESEARCH_MAX_WALL_TIME_SECONDS, RESEARCH_MAX_NOTE_BYTES), add
max_wall_time_seconds and max_note_bytes to ResearchOutcome and the
ResearchOutput JSON struct, and add both keys to contract.rs
json_output_keys. Regenerated the pinned crates/gwiki/contract/gwiki.contract.json.

cargo fmt --check, clippy -D warnings, and cargo test -p gobby-wiki
(contract_builder_matches_pinned_json + contract_command_emits_pinned_json)
pass. Companion to gobby epic #15586 / M6 #15592.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: joshwilhelmi

crates/gwiki/contract/gwiki.contract.json

@@ -483,6 +483,8 @@
         "max_steps",
         "max_tokens",
         "max_sources",
+        "max_wall_time_seconds",
+        "max_note_bytes",
         "write_conflict",
         "sources_added",
         "accepted_notes",

crates/gwiki/src/commands/research.rs

@@ -14,6 +14,8 @@ struct ResearchOutput {
     max_steps: usize,
     max_tokens: usize,
     max_sources: usize,
+    max_wall_time_seconds: u64,
+    max_note_bytes: usize,
     write_conflict: bool,
     sources_added: Vec<String>,
     accepted_notes: Vec<crate::session::AcceptedResearchNote>,
@@ -40,6 +42,8 @@ pub(crate) fn execute(options: research::ResearchOptions) -> Result<CommandOutco
         max_steps: outcome.max_steps,
         max_tokens: outcome.max_tokens,
         max_sources: outcome.max_sources,
+        max_wall_time_seconds: outcome.max_wall_time_seconds,
+        max_note_bytes: outcome.max_note_bytes,
         write_conflict: outcome.write_conflict,
         sources_added: outcome.sources_added,
         accepted_notes: outcome.session.accepted_notes,

crates/gwiki/src/contract.rs

@@ -175,6 +175,8 @@ pub fn contract() -> CliContract {
                     "max_steps",
                     "max_tokens",
                     "max_sources",
+                    "max_wall_time_seconds",
+                    "max_note_bytes",
                     "write_conflict",
                     "sources_added",
                     "accepted_notes",

crates/gwiki/src/research.rs

@@ -24,6 +24,10 @@ use crate::session::{AcceptedResearchNote, ResearchScope, ResearchSession, resea
 use crate::{CommandOutcome, IngestFileOptions, ReadTarget, ScopeSelection, WikiError};
 
 const MAX_RESEARCH_NOTE_SUFFIX_ATTEMPTS: usize = 1000;
+/// Enforced research-loop budgets, echoed in JSON output so callers see every
+/// limit that can stop a run.
+const RESEARCH_MAX_WALL_TIME_SECONDS: u64 = 900;
+const RESEARCH_MAX_NOTE_BYTES: usize = 24_000;
 const RESEARCH_NOTE_MARKER_STALE_AFTER: Duration = Duration::from_secs(15 * 60);
 const RESEARCH_NOTE_MATERIALIZE_TIMEOUT: Duration = Duration::from_secs(10);
 const RESEARCH_NOTE_MATERIALIZE_INITIAL_DELAY: Duration = Duration::from_millis(25);
@@ -90,6 +94,8 @@ pub struct ResearchOutcome {
     pub max_steps: usize,
     pub max_tokens: usize,
     pub max_sources: usize,
+    pub max_wall_time_seconds: u64,
+    pub max_note_bytes: usize,
     pub write_conflict: bool,
     pub sources_added: Vec<String>,
     pub findings: Vec<AuditFinding>,
@@ -210,6 +216,8 @@ pub fn run(options: ResearchOptions) -> Result<ResearchOutcome, WikiError> {
             max_steps: options.max_steps,
             max_tokens: options.max_tokens,
             max_sources: options.max_sources,
+            max_wall_time_seconds: RESEARCH_MAX_WALL_TIME_SECONDS,
+            max_note_bytes: RESEARCH_MAX_NOTE_BYTES,
             write_conflict: loop_result.write_conflict,
             sources_added: loop_result.sources_added,
             findings: Vec::new(),
@@ -247,6 +255,8 @@ pub fn run(options: ResearchOptions) -> Result<ResearchOutcome, WikiError> {
         max_steps: options.max_steps,
         max_tokens: options.max_tokens,
         max_sources: options.max_sources,
+        max_wall_time_seconds: RESEARCH_MAX_WALL_TIME_SECONDS,
+        max_note_bytes: RESEARCH_MAX_NOTE_BYTES,
         write_conflict: false,
         sources_added: Vec::new(),
         findings,
@@ -290,8 +300,8 @@ fn run_enrichment_loop(
             max_steps: options.max_steps,
             max_tokens: options.max_tokens,
             max_sources: options.max_sources,
-            max_wall_time: Duration::from_secs(900),
-            max_note_bytes: 24_000,
+            max_wall_time: Duration::from_secs(RESEARCH_MAX_WALL_TIME_SECONDS),
+            max_note_bytes: RESEARCH_MAX_NOTE_BYTES,
         },
         ResearchLoopDeps {
             model: &mut model,