Reuse bounded Git sessions for small streaming reads

CHANGELOG.md

@@ -7,6 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Performance
+
+- **Bounded stream session reads** - `readBlobStream()` now reuses the
+  persistent `cat-file` session for blobs at or below a fixed 10 MiB ceiling,
+  removing process-per-payload startup for small reads. Larger objects retain
+  the genuine one-shot streaming path without a speculative content read, and
+  plumbing without typed sessions retains the existing fallback.
+
 ## [6.5.6] — 2026-07-30
 
 ### Changed

ROADMAP.md

@@ -43,7 +43,8 @@ GitHub wins and this file should be corrected.
 | [`v6.5.3`](https://github.com/git-stunts/git-cas/milestone/13) | Coherent Git object sessions across immutable writes        | [#94](https://github.com/git-stunts/git-cas/issues/94)                                                                                                                                                                         |
 | [`v6.5.4`](https://github.com/git-stunts/git-cas/milestone/14) | Batched staging-workspace page retention                    | [#99](https://github.com/git-stunts/git-cas/issues/99)                                                                                                                                                                         |
 | [`v6.5.5`](https://github.com/git-stunts/git-cas/milestone/15) | Identity-independent internal Git commits                   | [#102](https://github.com/git-stunts/git-cas/issues/102)                                                                                                                                                                       |
-| [`v6.5.6`](https://github.com/git-stunts/git-cas/milestone/16) | Bijou 7 framed cockpit and deterministic ref conflicts      | [#105](https://github.com/git-stunts/git-cas/issues/105), [#106](https://github.com/git-stunts/git-cas/issues/106), [#111](https://github.com/git-stunts/git-cas/issues/111)                                                    |
+| [`v6.5.6`](https://github.com/git-stunts/git-cas/milestone/16) | Bijou 7 framed cockpit and deterministic ref conflicts      | [#105](https://github.com/git-stunts/git-cas/issues/105), [#106](https://github.com/git-stunts/git-cas/issues/106), [#111](https://github.com/git-stunts/git-cas/issues/111)                                                   |
+| [`v6.5.7`](https://github.com/git-stunts/git-cas/milestone/17) | Bounded session-backed small payload stream reads           | [#115](https://github.com/git-stunts/git-cas/issues/115)                                                                                                                                                                       |
 | [`v6.6.0`](https://github.com/git-stunts/git-cas/milestone/9)  | Operator TUI and agent automation follow-through            | [#39](https://github.com/git-stunts/git-cas/issues/39), [#40](https://github.com/git-stunts/git-cas/issues/40)                                                                                                                 |
 | [`v6.7.0`](https://github.com/git-stunts/git-cas/milestone/10) | Browser and edge read-path exploration                      | [#41](https://github.com/git-stunts/git-cas/issues/41)                                                                                                                                                                         |
 | [`v7.0.0`](https://github.com/git-stunts/git-cas/milestone/6)  | Protocol break only if audit requires it                    | [#42](https://github.com/git-stunts/git-cas/issues/42), only when justified                                                                                                                                                    |

STATUS.md

@@ -146,11 +146,15 @@
 - GitHub Issues are canonical. If this section and GitHub disagree, GitHub
   wins and this section should be corrected.
 - Current release goalpost:
+  [#115 v6.5.7: Reuse bounded Git sessions for small streaming reads](https://github.com/git-stunts/git-cas/issues/115)
+  under the
+  [`v6.5.7` milestone](https://github.com/git-stunts/git-cas/milestone/17).
+- The broader
   [#39 v6.6.0: Operator TUI](https://github.com/git-stunts/git-cas/issues/39)
   and
   [#40 v6.6.0: Agent automation follow-through](https://github.com/git-stunts/git-cas/issues/40)
-  under the
-  [`v6.6.0` milestone](https://github.com/git-stunts/git-cas/milestone/9).
+  goalposts remain queued under
+  [`v6.6.0`](https://github.com/git-stunts/git-cas/milestone/9).
 - The latest landed design record is
   [0057-deterministic-ref-conflict-posture](./docs/design/0057-deterministic-ref-conflict-posture/deterministic-ref-conflict-posture.md).